diff --git a/mlprec/impl/mld_caggrmat_biz_asb.F90 b/mlprec/impl/mld_caggrmat_biz_asb.F90
new file mode 100644
index 00000000..97d1ee4a
--- /dev/null
+++ b/mlprec/impl/mld_caggrmat_biz_asb.F90
@@ -0,0 +1,523 @@
+!!$ 
+!!$ 
+!!$                           MLD2P4  version 2.0
+!!$  MultiLevel Domain Decomposition Parallel Preconditioners Package
+!!$             based on PSBLAS (Parallel Sparse BLAS version 3.0)
+!!$  
+!!$  (C) Copyright 2008,2009,2010
+!!$
+!!$                      Salvatore Filippone  University of Rome Tor Vergata
+!!$                      Alfredo Buttari      CNRS-IRIT, Toulouse
+!!$                      Pasqua D'Ambra       ICAR-CNR, Naples
+!!$                      Daniela di Serafino  Second University of Naples
+!!$ 
+!!$  Redistribution and use in source and binary forms, with or without
+!!$  modification, are permitted provided that the following conditions
+!!$  are met:
+!!$    1. Redistributions of source code must retain the above copyright
+!!$       notice, this list of conditions and the following disclaimer.
+!!$    2. Redistributions in binary form must reproduce the above copyright
+!!$       notice, this list of conditions, and the following disclaimer in the
+!!$       documentation and/or other materials provided with the distribution.
+!!$    3. The name of the MLD2P4 group or the names of its contributors may
+!!$       not be used to endorse or promote products derived from this
+!!$       software without specific written permission.
+!!$ 
+!!$  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!!$  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!!$  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!!$  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE MLD2P4 GROUP OR ITS CONTRIBUTORS
+!!$  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!!$  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!!$  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!!$  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!!$  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!!$  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!!$  POSSIBILITY OF SUCH DAMAGE.
+!!$ 
+!!$
+! File: mld_caggrmat_biz_asb.F90
+!
+! Subroutine: mld_caggrmat_biz_asb
+! Version:    complex
+!
+!  This routine builds a coarse-level matrix A_C from a fine-level matrix A
+!  by using the Galerkin approach, i.e.
+!
+!                               A_C = P_C^T A P_C,
+!
+!  where P_C is a prolongator from the coarse level to the fine one.
+! 
+!  This routine builds A_C according to a "bizarre" aggregation algorithm,
+!  using a "naive" prolongator proposed by the authors of MLD2P4. However, this
+!  prolongator still requires a deep analysis and testing and its use is not
+!  recommended.
+!
+!  The coarse-level matrix A_C is distributed among the parallel processes or
+!  replicated on each of them, according to the value of p%parms%coarse_mat,
+!  specified by the user through mld_cprecinit and mld_zprecset.
+!
+! Arguments:
+!    a          -  type(psb_cspmat_type), input.     
+!                  The sparse matrix structure containing the local part of
+!                  the fine-level matrix.
+!    desc_a     -  type(psb_desc_type), input.
+!                  The communication descriptor of the fine-level matrix.
+!    p          -  type(mld_c_onelev_type), input/output.
+!                  The 'one-level' data structure that will contain the local
+!                  part of the matrix to be built as well as the information 
+!                  concerning the prolongator and its transpose.
+!    ilaggr     -  integer, dimension(:), allocatable.
+!                  The mapping between the row indices of the coarse-level
+!                  matrix and the row indices of the fine-level matrix.
+!                  ilaggr(i)=j means that node i in the adjacency graph
+!                  of the fine-level matrix is mapped onto node j in the
+!                  adjacency graph of the coarse-level matrix.
+!    nlaggr     -  integer, dimension(:), allocatable.
+!                  nlaggr(i) contains the aggregates held by process i.
+!    info       -  integer, output.
+!                  Error code.
+!
+subroutine mld_caggrmat_biz_asb(a,desc_a,ilaggr,nlaggr,p,info)
+  use psb_base_mod
+  use mld_c_inner_mod, mld_protect_name => mld_caggrmat_biz_asb
+
+  implicit none
+
+  ! Arguments
+  type(psb_cspmat_type), intent(in)             :: a
+  type(psb_desc_type), intent(in)               :: desc_a
+  integer, intent(inout)                        :: ilaggr(:), nlaggr(:)
+  type(mld_c_onelev_type), intent(inout), target :: p
+  integer, intent(out)                          :: info
+  type(psb_cspmat_type) :: op_prol, op_restr, b
+
+  ! Local variables
+  integer :: nrow, nglob, ncol, ntaggr, ip, ndx,&
+       & naggr, nzl,naggrm1,naggrp1, i, j, k, jd, icolF, nrw
+  integer ::ictxt, np, me, err_act
+  character(len=20) :: name
+  type(psb_cspmat_type) :: am3, am4
+  type(psb_c_coo_sparse_mat) :: acoo, acoof, bcoo
+  type(psb_c_csr_sparse_mat) :: acsr1, acsr2, acsr3, acsrf, ptilde
+  complex(psb_spk_), allocatable :: adiag(:)
+  integer(psb_ipk_)  :: ierr(5)
+  logical            :: filter_mat
+  integer            :: debug_level, debug_unit
+  integer, parameter :: ncmax=16
+  real(psb_spk_)     :: anorm, omega, tmp, dg, theta
+
+  name='mld_aggrmat_biz_asb'
+  if(psb_get_errstatus().ne.0) return 
+  info=psb_success_
+  call psb_erractionsave(err_act)
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+
+  ictxt = desc_a%get_context()
+  ictxt = desc_a%get_context()
+
+  call psb_info(ictxt, me, np)
+
+  nglob = desc_a%get_global_rows()
+  nrow  = desc_a%get_local_rows()
+  ncol  = desc_a%get_local_cols()
+
+  theta = p%parms%aggr_thresh
+
+  naggr  = nlaggr(me+1)
+  ntaggr = sum(nlaggr)
+
+  naggrm1 = sum(nlaggr(1:me))
+  naggrp1 = sum(nlaggr(1:me+1))
+
+  filter_mat = (p%parms%aggr_filter == mld_filter_mat_)
+
+  ilaggr(1:nrow) = ilaggr(1:nrow) + naggrm1
+  call psb_halo(ilaggr,desc_a,info)
+
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_halo')
+    goto 9999
+  end if
+
+  ! naggr: number of local aggregates
+  ! nrow: local rows. 
+  ! 
+  allocate(adiag(ncol),stat=info)
+
+  if (info /= psb_success_) then 
+    info=psb_err_alloc_request_; ierr(1)=nrow;
+    call psb_errpush(info,name,i_err=ierr,a_err='complex(psb_spk_)')
+    goto 9999      
+  end if
+
+  ! Get the diagonal D
+  call a%get_diag(adiag,info)
+  if (info == psb_success_) &
+       & call psb_halo(adiag,desc_a,info)
+
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_getdiag')
+    goto 9999
+  end if
+
+  ! 1. Allocate Ptilde in sparse matrix form 
+  call acoo%allocate(ncol,naggr,ncol)
+  do i=1,nrow
+    acoo%val(i) = cone
+    acoo%ia(i)  = i
+    acoo%ja(i)  = ilaggr(i)  
+  end do
+  call acoo%set_nzeros(nrow)
+  call acoo%set_dupl(psb_dupl_add_)
+
+  call ptilde%mv_from_coo(acoo,info)
+  if (info == psb_success_) call a%cscnv(acsr3,info,dupl=psb_dupl_add_)
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & ' Initial copies sone.'
+
+  if (filter_mat) then
+    !
+    ! Build the filtered matrix Af from A
+    ! 
+    if (info == psb_success_) call a%cscnv(acsrf,info,dupl=psb_dupl_add_)
+
+    do i=1,nrow
+      tmp = czero
+      jd  = -1 
+      do j=acsrf%irp(i),acsrf%irp(i+1)-1
+        if (acsrf%ja(j) == i) jd = j 
+        if (abs(acsrf%val(j)) < theta*sqrt(abs(adiag(i)*adiag(acsrf%ja(j))))) then
+          tmp=tmp+acsrf%val(j)
+          acsrf%val(j)=czero
+        endif
+
+      enddo
+      if (jd == -1) then 
+        write(0,*) 'Wrong input: we need the diagonal!!!!', i
+      else
+        acsrf%val(jd)=acsrf%val(jd)-tmp
+      end if
+    enddo
+    ! Take out zeroed terms 
+    call acsrf%mv_to_coo(acoof,info)
+    k = 0
+    do j=1,acoof%get_nzeros()
+      if ((acoof%val(j) /= czero) .or. (acoof%ia(j) == acoof%ja(j))) then 
+        k = k + 1
+        acoof%val(k) = acoof%val(j)
+        acoof%ia(k)  = acoof%ia(j)
+        acoof%ja(k)  = acoof%ja(j)
+      end if
+    end do
+    call acoof%set_nzeros(k)
+    call acoof%set_dupl(psb_dupl_add_)
+    call acsrf%mv_from_coo(acoof,info)
+  end if
+
+
+  do i=1,size(adiag)
+    if (adiag(i) /= czero) then
+      adiag(i) = cone / adiag(i)
+    else
+      adiag(i) = cone
+    end if
+  end do
+
+  if (filter_mat) call acsrf%scal(adiag,info)
+  if (info == psb_success_) call acsr3%scal(adiag,info)
+  if (info /= psb_success_) goto 9999
+
+
+  if (p%parms%aggr_omega_alg == mld_eig_est_) then 
+
+    if (p%parms%aggr_eig == mld_max_norm_) then 
+
+      ! 
+      ! This only works with CSR
+      !
+      anorm = szero
+      dg    = sone
+      nrw = acsr3%get_nrows()
+      do i=1, nrw
+        tmp = szero
+        do j=acsr3%irp(i),acsr3%irp(i+1)-1
+          if (acsr3%ja(j) <= nrw) then 
+            tmp = tmp + abs(acsr3%val(j))
+          endif
+          if (acsr3%ja(j) == i ) then 
+            dg = abs(acsr3%val(j))
+          end if
+        end do
+        anorm = max(anorm,tmp/dg) 
+      enddo
+
+      call psb_amx(ictxt,anorm)     
+      if (info /= psb_success_) then 
+        call psb_errpush(psb_err_internal_error_,name,a_err='Invalid AM3 storage format')
+        goto 9999
+      end if
+      omega = 4.d0/(3.d0*anorm)
+      p%parms%aggr_omega_val = omega 
+
+    else 
+      info = psb_err_internal_error_
+      call psb_errpush(info,name,a_err='invalid mld_aggr_eig_')
+      goto 9999
+    end if
+
+  else if (p%parms%aggr_omega_alg == mld_user_choice_) then 
+
+    omega = p%parms%aggr_omega_val 
+
+  else if (p%parms%aggr_omega_alg /= mld_user_choice_) then 
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,a_err='invalid mld_aggr_omega_alg_')
+    goto 9999
+  end if
+
+  if (filter_mat) then
+    !
+    ! Build the smoothed prolongator using the filtered matrix
+    ! 
+    do i=1,acsrf%get_nrows()
+      do j=acsrf%irp(i),acsrf%irp(i+1)-1
+        if (acsrf%ja(j) == i) then 
+          acsrf%val(j) = cone - omega*acsrf%val(j) 
+        else
+          acsrf%val(j) = - omega*acsrf%val(j) 
+        end if
+      end do
+    end do
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done gather, going for SYMBMM 1'
+    !
+    ! Symbmm90 does the allocation for its result.
+    ! 
+    ! acsrm1 = (I-w*D*Af)Ptilde
+    ! Doing it this way means to consider diag(Af_i)
+    ! 
+    !
+    call psb_symbmm(acsrf,ptilde,acsr1,info)
+    if(info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 1')
+      goto 9999
+    end if
+
+    call psb_numbmm(acsrf,ptilde,acsr1)
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done NUMBMM 1'
+
+  else
+    !
+    ! Build the smoothed prolongator using the original matrix
+    !
+    do i=1,acsr3%get_nrows()
+      do j=acsr3%irp(i),acsr3%irp(i+1)-1
+        if (acsr3%ja(j) == i) then 
+          acsr3%val(j) = cone - omega*acsr3%val(j) 
+        else
+          acsr3%val(j) = - omega*acsr3%val(j) 
+        end if
+      end do
+    end do
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done gather, going for SYMBMM 1'
+    !
+    ! Symbmm90 does the allocation for its result.
+    ! 
+    ! acsrm1 = (I-w*D*A)Ptilde
+    ! Doing it this way means to consider diag(A_i)
+    ! 
+    !
+    call psb_symbmm(acsr3,ptilde,acsr1,info)
+    if(info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 1')
+      goto 9999
+    end if
+
+    call psb_numbmm(acsr3,ptilde,acsr1)
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done NUMBMM 1'
+
+  end if
+  call ptilde%free()
+  call acsr1%set_dupl(psb_dupl_add_)
+
+  call op_prol%mv_from(acsr1)
+
+  call psb_rwextd(ncol,op_prol,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Halo of op_prol')
+    goto 9999
+  end if
+
+  call psb_symbmm(a,op_prol,am3,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 2')
+    goto 9999
+  end if
+
+  call psb_numbmm(a,op_prol,am3)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'Done NUMBMM 2',p%parms%aggr_kind, mld_smooth_prol_
+
+  call op_prol%transp(op_restr)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'starting sphalo/ rwxtd'
+
+  call psb_rwextd(ncol,am3,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Extend am3')
+    goto 9999
+  end if
+
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'starting symbmm 3'
+  call psb_symbmm(op_restr,am3,b,info)
+  if (info == psb_success_) call psb_numbmm(op_restr,am3,b)
+  if (info == psb_success_) call am3%free()
+  if (info == psb_success_) call b%cscnv(info,type='coo',dupl=psb_dupl_add_)
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Build b = op_restr x am3')
+    goto 9999
+  end if
+
+
+
+
+  select case(p%parms%coarse_mat)
+
+  case(mld_distr_mat_) 
+
+    nzl = b%get_nzeros()
+    call b%mv_to(bcoo)
+
+    if (info == psb_success_) call psb_cdall(ictxt,p%desc_ac,info,nl=nlaggr(me+1))
+    if (info == psb_success_) call psb_cdins(nzl,bcoo%ia,bcoo%ja,p%desc_ac,info)
+    if (info == psb_success_) call psb_cdasb(p%desc_ac,info)
+    if (info == psb_success_) call psb_glob_to_loc(bcoo%ia(1:nzl),p%desc_ac,info,iact='I')
+    if (info == psb_success_) call psb_glob_to_loc(bcoo%ja(1:nzl),p%desc_ac,info,iact='I')
+    if (info /= psb_success_) then
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Creating p%desc_ac and converting ac')
+      goto 9999
+    end if
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Assembld aux descr. distr.'
+    call p%ac%mv_from(bcoo)
+
+    call p%ac%set_nrows(p%desc_ac%get_local_rows())
+    call p%ac%set_ncols(p%desc_ac%get_local_cols())
+    call p%ac%set_asb()
+
+    if (info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_sp_free')
+      goto 9999
+    end if
+
+    if (np>1) then 
+      call op_prol%mv_to(acsr1)
+      nzl = acsr1%get_nzeros()
+      call psb_glob_to_loc(acsr1%ja(1:nzl),p%desc_ac,info,'I')
+      if(info /= psb_success_) then
+        call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_glob_to_loc')
+        goto 9999
+      end if
+      call op_prol%mv_from(acsr1)
+    endif
+    call op_prol%set_ncols(p%desc_ac%get_local_cols())
+
+    if (np>1) then 
+      call op_restr%cscnv(info,type='coo',dupl=psb_dupl_add_)
+      call op_restr%mv_to(acoo)
+      nzl = acoo%get_nzeros()
+      if (info == psb_success_) call psb_glob_to_loc(acoo%ia(1:nzl),p%desc_ac,info,'I')
+      call acoo%set_dupl(psb_dupl_add_)
+      if (info == psb_success_) call op_restr%mv_from(acoo)
+      if (info == psb_success_) call op_restr%cscnv(info,type='csr')        
+      if(info /= psb_success_) then
+        call psb_errpush(psb_err_internal_error_,name,a_err='Converting op_restr to local')
+        goto 9999
+      end if
+    end if
+    call op_restr%set_nrows(p%desc_ac%get_local_cols())
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done ac '
+
+  case(mld_repl_mat_) 
+    !
+    !
+    call psb_cdall(ictxt,p%desc_ac,info,mg=ntaggr,repl=.true.)
+    if (info == psb_success_) call psb_cdasb(p%desc_ac,info)
+    if (info == psb_success_) &
+         & call psb_gather(p%ac,b,p%desc_ac,info,dupl=psb_dupl_add_,keeploc=.false.)
+
+    if (info /= psb_success_) goto 9999
+
+  case default 
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,a_err='invalid mld_coarse_mat_')
+    goto 9999
+  end select
+
+
+
+  call p%ac%cscnv(info,type='csr',dupl=psb_dupl_add_)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='spcnv')
+    goto 9999
+  end if
+
+  !
+  ! Copy the prolongation/restriction matrices into the descriptor map.
+  !  op_restr => PR^T   i.e. restriction  operator
+  !  op_prol => PR     i.e. prolongation operator
+  !  
+
+  p%map = psb_linmap(psb_map_aggr_,desc_a,&
+       & p%desc_ac,op_restr,op_prol,ilaggr,nlaggr)
+  if (info == psb_success_) call op_prol%free()
+  if (info == psb_success_) call op_restr%free()
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_Free')
+    goto 9999
+  end if
+
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'Done smooth_aggregate '
+  call psb_erractionrestore(err_act)
+  return
+
+9999 continue
+  call psb_errpush(info,name)
+  call psb_erractionrestore(err_act)
+  if (err_act.eq.psb_act_abort_) then
+    call psb_error()
+    return
+  end if
+  return
+
+
+
+end subroutine mld_caggrmat_biz_asb
diff --git a/mlprec/impl/mld_daggrmat_biz_asb.F90 b/mlprec/impl/mld_daggrmat_biz_asb.F90
new file mode 100644
index 00000000..91e0178d
--- /dev/null
+++ b/mlprec/impl/mld_daggrmat_biz_asb.F90
@@ -0,0 +1,523 @@
+!!$ 
+!!$ 
+!!$                           MLD2P4  version 2.0
+!!$  MultiLevel Domain Decomposition Parallel Preconditioners Package
+!!$             based on PSBLAS (Parallel Sparse BLAS version 3.0)
+!!$  
+!!$  (C) Copyright 2008,2009,2010
+!!$
+!!$                      Salvatore Filippone  University of Rome Tor Vergata
+!!$                      Alfredo Buttari      CNRS-IRIT, Toulouse
+!!$                      Pasqua D'Ambra       ICAR-CNR, Naples
+!!$                      Daniela di Serafino  Second University of Naples
+!!$ 
+!!$  Redistribution and use in source and binary forms, with or without
+!!$  modification, are permitted provided that the following conditions
+!!$  are met:
+!!$    1. Redistributions of source code must retain the above copyright
+!!$       notice, this list of conditions and the following disclaimer.
+!!$    2. Redistributions in binary form must reproduce the above copyright
+!!$       notice, this list of conditions, and the following disclaimer in the
+!!$       documentation and/or other materials provided with the distribution.
+!!$    3. The name of the MLD2P4 group or the names of its contributors may
+!!$       not be used to endorse or promote products derived from this
+!!$       software without specific written permission.
+!!$ 
+!!$  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!!$  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!!$  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!!$  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE MLD2P4 GROUP OR ITS CONTRIBUTORS
+!!$  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!!$  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!!$  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!!$  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!!$  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!!$  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!!$  POSSIBILITY OF SUCH DAMAGE.
+!!$ 
+!!$
+! File: mld_daggrmat_biz_asb.F90
+!
+! Subroutine: mld_daggrmat_biz_asb
+! Version:    real
+!
+!  This routine builds a coarse-level matrix A_C from a fine-level matrix A
+!  by using the Galerkin approach, i.e.
+!
+!                               A_C = P_C^T A P_C,
+!
+!  where P_C is a prolongator from the coarse level to the fine one.
+! 
+!  This routine builds A_C according to a "bizarre" aggregation algorithm,
+!  using a "naive" prolongator proposed by the authors of MLD2P4. However, this
+!  prolongator still requires a deep analysis and testing and its use is not
+!  recommended.
+!
+!  The coarse-level matrix A_C is distributed among the parallel processes or
+!  replicated on each of them, according to the value of p%parms%coarse_mat,
+!  specified by the user through mld_dprecinit and mld_zprecset.
+!
+! Arguments:
+!    a          -  type(psb_dspmat_type), input.     
+!                  The sparse matrix structure containing the local part of
+!                  the fine-level matrix.
+!    desc_a     -  type(psb_desc_type), input.
+!                  The communication descriptor of the fine-level matrix.
+!    p          -  type(mld_d_onelev_type), input/output.
+!                  The 'one-level' data structure that will contain the local
+!                  part of the matrix to be built as well as the information 
+!                  concerning the prolongator and its transpose.
+!    ilaggr     -  integer, dimension(:), allocatable.
+!                  The mapping between the row indices of the coarse-level
+!                  matrix and the row indices of the fine-level matrix.
+!                  ilaggr(i)=j means that node i in the adjacency graph
+!                  of the fine-level matrix is mapped onto node j in the
+!                  adjacency graph of the coarse-level matrix.
+!    nlaggr     -  integer, dimension(:), allocatable.
+!                  nlaggr(i) contains the aggregates held by process i.
+!    info       -  integer, output.
+!                  Error code.
+!
+subroutine mld_daggrmat_biz_asb(a,desc_a,ilaggr,nlaggr,p,info)
+  use psb_base_mod
+  use mld_d_inner_mod, mld_protect_name => mld_daggrmat_biz_asb
+
+  implicit none
+
+  ! Arguments
+  type(psb_dspmat_type), intent(in)             :: a
+  type(psb_desc_type), intent(in)               :: desc_a
+  integer, intent(inout)                        :: ilaggr(:), nlaggr(:)
+  type(mld_d_onelev_type), intent(inout), target :: p
+  integer, intent(out)                          :: info
+  type(psb_dspmat_type) :: op_prol, op_restr, b
+
+  ! Local variables
+  integer :: nrow, nglob, ncol, ntaggr, ip, ndx,&
+       & naggr, nzl,naggrm1,naggrp1, i, j, k, jd, icolF, nrw
+  integer ::ictxt, np, me, err_act
+  character(len=20) :: name
+  type(psb_dspmat_type) :: am3, am4
+  type(psb_d_coo_sparse_mat) :: acoo, acoof, bcoo
+  type(psb_d_csr_sparse_mat) :: acsr1, acsr2, acsr3, acsrf, ptilde
+  real(psb_dpk_), allocatable :: adiag(:)
+  integer(psb_ipk_)  :: ierr(5)
+  logical            :: filter_mat
+  integer            :: debug_level, debug_unit
+  integer, parameter :: ncmax=16
+  real(psb_dpk_)     :: anorm, omega, tmp, dg, theta
+
+  name='mld_aggrmat_biz_asb'
+  if(psb_get_errstatus().ne.0) return 
+  info=psb_success_
+  call psb_erractionsave(err_act)
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+
+  ictxt = desc_a%get_context()
+  ictxt = desc_a%get_context()
+
+  call psb_info(ictxt, me, np)
+
+  nglob = desc_a%get_global_rows()
+  nrow  = desc_a%get_local_rows()
+  ncol  = desc_a%get_local_cols()
+
+  theta = p%parms%aggr_thresh
+
+  naggr  = nlaggr(me+1)
+  ntaggr = sum(nlaggr)
+
+  naggrm1 = sum(nlaggr(1:me))
+  naggrp1 = sum(nlaggr(1:me+1))
+
+  filter_mat = (p%parms%aggr_filter == mld_filter_mat_)
+
+  ilaggr(1:nrow) = ilaggr(1:nrow) + naggrm1
+  call psb_halo(ilaggr,desc_a,info)
+
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_halo')
+    goto 9999
+  end if
+
+  ! naggr: number of local aggregates
+  ! nrow: local rows. 
+  ! 
+  allocate(adiag(ncol),stat=info)
+
+  if (info /= psb_success_) then 
+    info=psb_err_alloc_request_; ierr(1)=nrow;
+    call psb_errpush(info,name,i_err=ierr,a_err='real(psb_dpk_)')
+    goto 9999      
+  end if
+
+  ! Get the diagonal D
+  call a%get_diag(adiag,info)
+  if (info == psb_success_) &
+       & call psb_halo(adiag,desc_a,info)
+
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_getdiag')
+    goto 9999
+  end if
+
+  ! 1. Allocate Ptilde in sparse matrix form 
+  call acoo%allocate(ncol,naggr,ncol)
+  do i=1,nrow
+    acoo%val(i) = done
+    acoo%ia(i)  = i
+    acoo%ja(i)  = ilaggr(i)  
+  end do
+  call acoo%set_nzeros(nrow)
+  call acoo%set_dupl(psb_dupl_add_)
+
+  call ptilde%mv_from_coo(acoo,info)
+  if (info == psb_success_) call a%cscnv(acsr3,info,dupl=psb_dupl_add_)
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & ' Initial copies sone.'
+
+  if (filter_mat) then
+    !
+    ! Build the filtered matrix Af from A
+    ! 
+    if (info == psb_success_) call a%cscnv(acsrf,info,dupl=psb_dupl_add_)
+
+    do i=1,nrow
+      tmp = dzero
+      jd  = -1 
+      do j=acsrf%irp(i),acsrf%irp(i+1)-1
+        if (acsrf%ja(j) == i) jd = j 
+        if (abs(acsrf%val(j)) < theta*sqrt(abs(adiag(i)*adiag(acsrf%ja(j))))) then
+          tmp=tmp+acsrf%val(j)
+          acsrf%val(j)=dzero
+        endif
+
+      enddo
+      if (jd == -1) then 
+        write(0,*) 'Wrong input: we need the diagonal!!!!', i
+      else
+        acsrf%val(jd)=acsrf%val(jd)-tmp
+      end if
+    enddo
+    ! Take out zeroed terms 
+    call acsrf%mv_to_coo(acoof,info)
+    k = 0
+    do j=1,acoof%get_nzeros()
+      if ((acoof%val(j) /= dzero) .or. (acoof%ia(j) == acoof%ja(j))) then 
+        k = k + 1
+        acoof%val(k) = acoof%val(j)
+        acoof%ia(k)  = acoof%ia(j)
+        acoof%ja(k)  = acoof%ja(j)
+      end if
+    end do
+    call acoof%set_nzeros(k)
+    call acoof%set_dupl(psb_dupl_add_)
+    call acsrf%mv_from_coo(acoof,info)
+  end if
+
+
+  do i=1,size(adiag)
+    if (adiag(i) /= dzero) then
+      adiag(i) = done / adiag(i)
+    else
+      adiag(i) = done
+    end if
+  end do
+
+  if (filter_mat) call acsrf%scal(adiag,info)
+  if (info == psb_success_) call acsr3%scal(adiag,info)
+  if (info /= psb_success_) goto 9999
+
+
+  if (p%parms%aggr_omega_alg == mld_eig_est_) then 
+
+    if (p%parms%aggr_eig == mld_max_norm_) then 
+
+      ! 
+      ! This only works with CSR
+      !
+      anorm = dzero
+      dg    = done
+      nrw = acsr3%get_nrows()
+      do i=1, nrw
+        tmp = dzero
+        do j=acsr3%irp(i),acsr3%irp(i+1)-1
+          if (acsr3%ja(j) <= nrw) then 
+            tmp = tmp + abs(acsr3%val(j))
+          endif
+          if (acsr3%ja(j) == i ) then 
+            dg = abs(acsr3%val(j))
+          end if
+        end do
+        anorm = max(anorm,tmp/dg) 
+      enddo
+
+      call psb_amx(ictxt,anorm)     
+      if (info /= psb_success_) then 
+        call psb_errpush(psb_err_internal_error_,name,a_err='Invalid AM3 storage format')
+        goto 9999
+      end if
+      omega = 4.d0/(3.d0*anorm)
+      p%parms%aggr_omega_val = omega 
+
+    else 
+      info = psb_err_internal_error_
+      call psb_errpush(info,name,a_err='invalid mld_aggr_eig_')
+      goto 9999
+    end if
+
+  else if (p%parms%aggr_omega_alg == mld_user_choice_) then 
+
+    omega = p%parms%aggr_omega_val 
+
+  else if (p%parms%aggr_omega_alg /= mld_user_choice_) then 
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,a_err='invalid mld_aggr_omega_alg_')
+    goto 9999
+  end if
+
+  if (filter_mat) then
+    !
+    ! Build the smoothed prolongator using the filtered matrix
+    ! 
+    do i=1,acsrf%get_nrows()
+      do j=acsrf%irp(i),acsrf%irp(i+1)-1
+        if (acsrf%ja(j) == i) then 
+          acsrf%val(j) = done - omega*acsrf%val(j) 
+        else
+          acsrf%val(j) = - omega*acsrf%val(j) 
+        end if
+      end do
+    end do
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done gather, going for SYMBMM 1'
+    !
+    ! Symbmm90 does the allocation for its result.
+    ! 
+    ! acsrm1 = (I-w*D*Af)Ptilde
+    ! Doing it this way means to consider diag(Af_i)
+    ! 
+    !
+    call psb_symbmm(acsrf,ptilde,acsr1,info)
+    if(info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 1')
+      goto 9999
+    end if
+
+    call psb_numbmm(acsrf,ptilde,acsr1)
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done NUMBMM 1'
+
+  else
+    !
+    ! Build the smoothed prolongator using the original matrix
+    !
+    do i=1,acsr3%get_nrows()
+      do j=acsr3%irp(i),acsr3%irp(i+1)-1
+        if (acsr3%ja(j) == i) then 
+          acsr3%val(j) = done - omega*acsr3%val(j) 
+        else
+          acsr3%val(j) = - omega*acsr3%val(j) 
+        end if
+      end do
+    end do
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done gather, going for SYMBMM 1'
+    !
+    ! Symbmm90 does the allocation for its result.
+    ! 
+    ! acsrm1 = (I-w*D*A)Ptilde
+    ! Doing it this way means to consider diag(A_i)
+    ! 
+    !
+    call psb_symbmm(acsr3,ptilde,acsr1,info)
+    if(info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 1')
+      goto 9999
+    end if
+
+    call psb_numbmm(acsr3,ptilde,acsr1)
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done NUMBMM 1'
+
+  end if
+  call ptilde%free()
+  call acsr1%set_dupl(psb_dupl_add_)
+
+  call op_prol%mv_from(acsr1)
+
+  call psb_rwextd(ncol,op_prol,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Halo of op_prol')
+    goto 9999
+  end if
+
+  call psb_symbmm(a,op_prol,am3,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 2')
+    goto 9999
+  end if
+
+  call psb_numbmm(a,op_prol,am3)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'Done NUMBMM 2',p%parms%aggr_kind, mld_smooth_prol_
+
+  call op_prol%transp(op_restr)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'starting sphalo/ rwxtd'
+
+  call psb_rwextd(ncol,am3,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Extend am3')
+    goto 9999
+  end if
+
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'starting symbmm 3'
+  call psb_symbmm(op_restr,am3,b,info)
+  if (info == psb_success_) call psb_numbmm(op_restr,am3,b)
+  if (info == psb_success_) call am3%free()
+  if (info == psb_success_) call b%cscnv(info,type='coo',dupl=psb_dupl_add_)
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Build b = op_restr x am3')
+    goto 9999
+  end if
+
+
+
+
+  select case(p%parms%coarse_mat)
+
+  case(mld_distr_mat_) 
+
+    nzl = b%get_nzeros()
+    call b%mv_to(bcoo)
+
+    if (info == psb_success_) call psb_cdall(ictxt,p%desc_ac,info,nl=nlaggr(me+1))
+    if (info == psb_success_) call psb_cdins(nzl,bcoo%ia,bcoo%ja,p%desc_ac,info)
+    if (info == psb_success_) call psb_cdasb(p%desc_ac,info)
+    if (info == psb_success_) call psb_glob_to_loc(bcoo%ia(1:nzl),p%desc_ac,info,iact='I')
+    if (info == psb_success_) call psb_glob_to_loc(bcoo%ja(1:nzl),p%desc_ac,info,iact='I')
+    if (info /= psb_success_) then
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Creating p%desc_ac and converting ac')
+      goto 9999
+    end if
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Assembld aux descr. distr.'
+    call p%ac%mv_from(bcoo)
+
+    call p%ac%set_nrows(p%desc_ac%get_local_rows())
+    call p%ac%set_ncols(p%desc_ac%get_local_cols())
+    call p%ac%set_asb()
+
+    if (info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_sp_free')
+      goto 9999
+    end if
+
+    if (np>1) then 
+      call op_prol%mv_to(acsr1)
+      nzl = acsr1%get_nzeros()
+      call psb_glob_to_loc(acsr1%ja(1:nzl),p%desc_ac,info,'I')
+      if(info /= psb_success_) then
+        call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_glob_to_loc')
+        goto 9999
+      end if
+      call op_prol%mv_from(acsr1)
+    endif
+    call op_prol%set_ncols(p%desc_ac%get_local_cols())
+
+    if (np>1) then 
+      call op_restr%cscnv(info,type='coo',dupl=psb_dupl_add_)
+      call op_restr%mv_to(acoo)
+      nzl = acoo%get_nzeros()
+      if (info == psb_success_) call psb_glob_to_loc(acoo%ia(1:nzl),p%desc_ac,info,'I')
+      call acoo%set_dupl(psb_dupl_add_)
+      if (info == psb_success_) call op_restr%mv_from(acoo)
+      if (info == psb_success_) call op_restr%cscnv(info,type='csr')        
+      if(info /= psb_success_) then
+        call psb_errpush(psb_err_internal_error_,name,a_err='Converting op_restr to local')
+        goto 9999
+      end if
+    end if
+    call op_restr%set_nrows(p%desc_ac%get_local_cols())
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done ac '
+
+  case(mld_repl_mat_) 
+    !
+    !
+    call psb_cdall(ictxt,p%desc_ac,info,mg=ntaggr,repl=.true.)
+    if (info == psb_success_) call psb_cdasb(p%desc_ac,info)
+    if (info == psb_success_) &
+         & call psb_gather(p%ac,b,p%desc_ac,info,dupl=psb_dupl_add_,keeploc=.false.)
+
+    if (info /= psb_success_) goto 9999
+
+  case default 
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,a_err='invalid mld_coarse_mat_')
+    goto 9999
+  end select
+
+
+
+  call p%ac%cscnv(info,type='csr',dupl=psb_dupl_add_)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='spcnv')
+    goto 9999
+  end if
+
+  !
+  ! Copy the prolongation/restriction matrices into the descriptor map.
+  !  op_restr => PR^T   i.e. restriction  operator
+  !  op_prol => PR     i.e. prolongation operator
+  !  
+
+  p%map = psb_linmap(psb_map_aggr_,desc_a,&
+       & p%desc_ac,op_restr,op_prol,ilaggr,nlaggr)
+  if (info == psb_success_) call op_prol%free()
+  if (info == psb_success_) call op_restr%free()
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_Free')
+    goto 9999
+  end if
+
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'Done smooth_aggregate '
+  call psb_erractionrestore(err_act)
+  return
+
+9999 continue
+  call psb_errpush(info,name)
+  call psb_erractionrestore(err_act)
+  if (err_act.eq.psb_act_abort_) then
+    call psb_error()
+    return
+  end if
+  return
+
+
+
+end subroutine mld_daggrmat_biz_asb
diff --git a/mlprec/impl/mld_saggrmat_biz_asb.F90 b/mlprec/impl/mld_saggrmat_biz_asb.F90
new file mode 100644
index 00000000..e1bf0552
--- /dev/null
+++ b/mlprec/impl/mld_saggrmat_biz_asb.F90
@@ -0,0 +1,523 @@
+!!$ 
+!!$ 
+!!$                           MLD2P4  version 2.0
+!!$  MultiLevel Domain Decomposition Parallel Preconditioners Package
+!!$             based on PSBLAS (Parallel Sparse BLAS version 3.0)
+!!$  
+!!$  (C) Copyright 2008,2009,2010
+!!$
+!!$                      Salvatore Filippone  University of Rome Tor Vergata
+!!$                      Alfredo Buttari      CNRS-IRIT, Toulouse
+!!$                      Pasqua D'Ambra       ICAR-CNR, Naples
+!!$                      Daniela di Serafino  Second University of Naples
+!!$ 
+!!$  Redistribution and use in source and binary forms, with or without
+!!$  modification, are permitted provided that the following conditions
+!!$  are met:
+!!$    1. Redistributions of source code must retain the above copyright
+!!$       notice, this list of conditions and the following disclaimer.
+!!$    2. Redistributions in binary form must reproduce the above copyright
+!!$       notice, this list of conditions, and the following disclaimer in the
+!!$       documentation and/or other materials provided with the distribution.
+!!$    3. The name of the MLD2P4 group or the names of its contributors may
+!!$       not be used to endorse or promote products derived from this
+!!$       software without specific written permission.
+!!$ 
+!!$  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!!$  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!!$  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!!$  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE MLD2P4 GROUP OR ITS CONTRIBUTORS
+!!$  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!!$  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!!$  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!!$  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!!$  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!!$  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!!$  POSSIBILITY OF SUCH DAMAGE.
+!!$ 
+!!$
+! File: mld_saggrmat_biz_asb.F90
+!
+! Subroutine: mld_saggrmat_biz_asb
+! Version:    real
+!
+!  This routine builds a coarse-level matrix A_C from a fine-level matrix A
+!  by using the Galerkin approach, i.e.
+!
+!                               A_C = P_C^T A P_C,
+!
+!  where P_C is a prolongator from the coarse level to the fine one.
+! 
+!  This routine builds A_C according to a "bizarre" aggregation algorithm,
+!  using a "naive" prolongator proposed by the authors of MLD2P4. However, this
+!  prolongator still requires a deep analysis and testing and its use is not
+!  recommended.
+!
+!  The coarse-level matrix A_C is distributed among the parallel processes or
+!  replicated on each of them, according to the value of p%parms%coarse_mat,
+!  specified by the user through mld_sprecinit and mld_zprecset.
+!
+! Arguments:
+!    a          -  type(psb_sspmat_type), input.     
+!                  The sparse matrix structure containing the local part of
+!                  the fine-level matrix.
+!    desc_a     -  type(psb_desc_type), input.
+!                  The communication descriptor of the fine-level matrix.
+!    p          -  type(mld_s_onelev_type), input/output.
+!                  The 'one-level' data structure that will contain the local
+!                  part of the matrix to be built as well as the information 
+!                  concerning the prolongator and its transpose.
+!    ilaggr     -  integer, dimension(:), allocatable.
+!                  The mapping between the row indices of the coarse-level
+!                  matrix and the row indices of the fine-level matrix.
+!                  ilaggr(i)=j means that node i in the adjacency graph
+!                  of the fine-level matrix is mapped onto node j in the
+!                  adjacency graph of the coarse-level matrix.
+!    nlaggr     -  integer, dimension(:), allocatable.
+!                  nlaggr(i) contains the aggregates held by process i.
+!    info       -  integer, output.
+!                  Error code.
+!
+subroutine mld_saggrmat_biz_asb(a,desc_a,ilaggr,nlaggr,p,info)
+  use psb_base_mod
+  use mld_s_inner_mod, mld_protect_name => mld_saggrmat_biz_asb
+
+  implicit none
+
+  ! Arguments
+  type(psb_sspmat_type), intent(in)             :: a
+  type(psb_desc_type), intent(in)               :: desc_a
+  integer, intent(inout)                        :: ilaggr(:), nlaggr(:)
+  type(mld_s_onelev_type), intent(inout), target :: p
+  integer, intent(out)                          :: info
+  type(psb_sspmat_type) :: op_prol, op_restr, b
+
+  ! Local variables
+  integer :: nrow, nglob, ncol, ntaggr, ip, ndx,&
+       & naggr, nzl,naggrm1,naggrp1, i, j, k, jd, icolF, nrw
+  integer ::ictxt, np, me, err_act
+  character(len=20) :: name
+  type(psb_sspmat_type) :: am3, am4
+  type(psb_s_coo_sparse_mat) :: acoo, acoof, bcoo
+  type(psb_s_csr_sparse_mat) :: acsr1, acsr2, acsr3, acsrf, ptilde
+  real(psb_spk_), allocatable :: adiag(:)
+  integer(psb_ipk_)  :: ierr(5)
+  logical            :: filter_mat
+  integer            :: debug_level, debug_unit
+  integer, parameter :: ncmax=16
+  real(psb_spk_)     :: anorm, omega, tmp, dg, theta
+
+  name='mld_aggrmat_biz_asb'
+  if(psb_get_errstatus().ne.0) return 
+  info=psb_success_
+  call psb_erractionsave(err_act)
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+
+  ictxt = desc_a%get_context()
+  ictxt = desc_a%get_context()
+
+  call psb_info(ictxt, me, np)
+
+  nglob = desc_a%get_global_rows()
+  nrow  = desc_a%get_local_rows()
+  ncol  = desc_a%get_local_cols()
+
+  theta = p%parms%aggr_thresh
+
+  naggr  = nlaggr(me+1)
+  ntaggr = sum(nlaggr)
+
+  naggrm1 = sum(nlaggr(1:me))
+  naggrp1 = sum(nlaggr(1:me+1))
+
+  filter_mat = (p%parms%aggr_filter == mld_filter_mat_)
+
+  ilaggr(1:nrow) = ilaggr(1:nrow) + naggrm1
+  call psb_halo(ilaggr,desc_a,info)
+
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_halo')
+    goto 9999
+  end if
+
+  ! naggr: number of local aggregates
+  ! nrow: local rows. 
+  ! 
+  allocate(adiag(ncol),stat=info)
+
+  if (info /= psb_success_) then 
+    info=psb_err_alloc_request_; ierr(1)=nrow;
+    call psb_errpush(info,name,i_err=ierr,a_err='real(psb_spk_)')
+    goto 9999      
+  end if
+
+  ! Get the diagonal D
+  call a%get_diag(adiag,info)
+  if (info == psb_success_) &
+       & call psb_halo(adiag,desc_a,info)
+
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_getdiag')
+    goto 9999
+  end if
+
+  ! 1. Allocate Ptilde in sparse matrix form 
+  call acoo%allocate(ncol,naggr,ncol)
+  do i=1,nrow
+    acoo%val(i) = sone
+    acoo%ia(i)  = i
+    acoo%ja(i)  = ilaggr(i)  
+  end do
+  call acoo%set_nzeros(nrow)
+  call acoo%set_dupl(psb_dupl_add_)
+
+  call ptilde%mv_from_coo(acoo,info)
+  if (info == psb_success_) call a%cscnv(acsr3,info,dupl=psb_dupl_add_)
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & ' Initial copies sone.'
+
+  if (filter_mat) then
+    !
+    ! Build the filtered matrix Af from A
+    ! 
+    if (info == psb_success_) call a%cscnv(acsrf,info,dupl=psb_dupl_add_)
+
+    do i=1,nrow
+      tmp = szero
+      jd  = -1 
+      do j=acsrf%irp(i),acsrf%irp(i+1)-1
+        if (acsrf%ja(j) == i) jd = j 
+        if (abs(acsrf%val(j)) < theta*sqrt(abs(adiag(i)*adiag(acsrf%ja(j))))) then
+          tmp=tmp+acsrf%val(j)
+          acsrf%val(j)=szero
+        endif
+
+      enddo
+      if (jd == -1) then 
+        write(0,*) 'Wrong input: we need the diagonal!!!!', i
+      else
+        acsrf%val(jd)=acsrf%val(jd)-tmp
+      end if
+    enddo
+    ! Take out zeroed terms 
+    call acsrf%mv_to_coo(acoof,info)
+    k = 0
+    do j=1,acoof%get_nzeros()
+      if ((acoof%val(j) /= szero) .or. (acoof%ia(j) == acoof%ja(j))) then 
+        k = k + 1
+        acoof%val(k) = acoof%val(j)
+        acoof%ia(k)  = acoof%ia(j)
+        acoof%ja(k)  = acoof%ja(j)
+      end if
+    end do
+    call acoof%set_nzeros(k)
+    call acoof%set_dupl(psb_dupl_add_)
+    call acsrf%mv_from_coo(acoof,info)
+  end if
+
+
+  do i=1,size(adiag)
+    if (adiag(i) /= szero) then
+      adiag(i) = sone / adiag(i)
+    else
+      adiag(i) = sone
+    end if
+  end do
+
+  if (filter_mat) call acsrf%scal(adiag,info)
+  if (info == psb_success_) call acsr3%scal(adiag,info)
+  if (info /= psb_success_) goto 9999
+
+
+  if (p%parms%aggr_omega_alg == mld_eig_est_) then 
+
+    if (p%parms%aggr_eig == mld_max_norm_) then 
+
+      ! 
+      ! This only works with CSR
+      !
+      anorm = szero
+      dg    = sone
+      nrw = acsr3%get_nrows()
+      do i=1, nrw
+        tmp = szero
+        do j=acsr3%irp(i),acsr3%irp(i+1)-1
+          if (acsr3%ja(j) <= nrw) then 
+            tmp = tmp + abs(acsr3%val(j))
+          endif
+          if (acsr3%ja(j) == i ) then 
+            dg = abs(acsr3%val(j))
+          end if
+        end do
+        anorm = max(anorm,tmp/dg) 
+      enddo
+
+      call psb_amx(ictxt,anorm)     
+      if (info /= psb_success_) then 
+        call psb_errpush(psb_err_internal_error_,name,a_err='Invalid AM3 storage format')
+        goto 9999
+      end if
+      omega = 4.d0/(3.d0*anorm)
+      p%parms%aggr_omega_val = omega 
+
+    else 
+      info = psb_err_internal_error_
+      call psb_errpush(info,name,a_err='invalid mld_aggr_eig_')
+      goto 9999
+    end if
+
+  else if (p%parms%aggr_omega_alg == mld_user_choice_) then 
+
+    omega = p%parms%aggr_omega_val 
+
+  else if (p%parms%aggr_omega_alg /= mld_user_choice_) then 
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,a_err='invalid mld_aggr_omega_alg_')
+    goto 9999
+  end if
+
+  if (filter_mat) then
+    !
+    ! Build the smoothed prolongator using the filtered matrix
+    ! 
+    do i=1,acsrf%get_nrows()
+      do j=acsrf%irp(i),acsrf%irp(i+1)-1
+        if (acsrf%ja(j) == i) then 
+          acsrf%val(j) = sone - omega*acsrf%val(j) 
+        else
+          acsrf%val(j) = - omega*acsrf%val(j) 
+        end if
+      end do
+    end do
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done gather, going for SYMBMM 1'
+    !
+    ! Symbmm90 does the allocation for its result.
+    ! 
+    ! acsrm1 = (I-w*D*Af)Ptilde
+    ! Doing it this way means to consider diag(Af_i)
+    ! 
+    !
+    call psb_symbmm(acsrf,ptilde,acsr1,info)
+    if(info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 1')
+      goto 9999
+    end if
+
+    call psb_numbmm(acsrf,ptilde,acsr1)
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done NUMBMM 1'
+
+  else
+    !
+    ! Build the smoothed prolongator using the original matrix
+    !
+    do i=1,acsr3%get_nrows()
+      do j=acsr3%irp(i),acsr3%irp(i+1)-1
+        if (acsr3%ja(j) == i) then 
+          acsr3%val(j) = sone - omega*acsr3%val(j) 
+        else
+          acsr3%val(j) = - omega*acsr3%val(j) 
+        end if
+      end do
+    end do
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done gather, going for SYMBMM 1'
+    !
+    ! Symbmm90 does the allocation for its result.
+    ! 
+    ! acsrm1 = (I-w*D*A)Ptilde
+    ! Doing it this way means to consider diag(A_i)
+    ! 
+    !
+    call psb_symbmm(acsr3,ptilde,acsr1,info)
+    if(info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 1')
+      goto 9999
+    end if
+
+    call psb_numbmm(acsr3,ptilde,acsr1)
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done NUMBMM 1'
+
+  end if
+  call ptilde%free()
+  call acsr1%set_dupl(psb_dupl_add_)
+
+  call op_prol%mv_from(acsr1)
+
+  call psb_rwextd(ncol,op_prol,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Halo of op_prol')
+    goto 9999
+  end if
+
+  call psb_symbmm(a,op_prol,am3,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 2')
+    goto 9999
+  end if
+
+  call psb_numbmm(a,op_prol,am3)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'Done NUMBMM 2',p%parms%aggr_kind, mld_smooth_prol_
+
+  call op_prol%transp(op_restr)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'starting sphalo/ rwxtd'
+
+  call psb_rwextd(ncol,am3,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Extend am3')
+    goto 9999
+  end if
+
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'starting symbmm 3'
+  call psb_symbmm(op_restr,am3,b,info)
+  if (info == psb_success_) call psb_numbmm(op_restr,am3,b)
+  if (info == psb_success_) call am3%free()
+  if (info == psb_success_) call b%cscnv(info,type='coo',dupl=psb_dupl_add_)
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Build b = op_restr x am3')
+    goto 9999
+  end if
+
+
+
+
+  select case(p%parms%coarse_mat)
+
+  case(mld_distr_mat_) 
+
+    nzl = b%get_nzeros()
+    call b%mv_to(bcoo)
+
+    if (info == psb_success_) call psb_cdall(ictxt,p%desc_ac,info,nl=nlaggr(me+1))
+    if (info == psb_success_) call psb_cdins(nzl,bcoo%ia,bcoo%ja,p%desc_ac,info)
+    if (info == psb_success_) call psb_cdasb(p%desc_ac,info)
+    if (info == psb_success_) call psb_glob_to_loc(bcoo%ia(1:nzl),p%desc_ac,info,iact='I')
+    if (info == psb_success_) call psb_glob_to_loc(bcoo%ja(1:nzl),p%desc_ac,info,iact='I')
+    if (info /= psb_success_) then
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Creating p%desc_ac and converting ac')
+      goto 9999
+    end if
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Assembld aux descr. distr.'
+    call p%ac%mv_from(bcoo)
+
+    call p%ac%set_nrows(p%desc_ac%get_local_rows())
+    call p%ac%set_ncols(p%desc_ac%get_local_cols())
+    call p%ac%set_asb()
+
+    if (info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_sp_free')
+      goto 9999
+    end if
+
+    if (np>1) then 
+      call op_prol%mv_to(acsr1)
+      nzl = acsr1%get_nzeros()
+      call psb_glob_to_loc(acsr1%ja(1:nzl),p%desc_ac,info,'I')
+      if(info /= psb_success_) then
+        call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_glob_to_loc')
+        goto 9999
+      end if
+      call op_prol%mv_from(acsr1)
+    endif
+    call op_prol%set_ncols(p%desc_ac%get_local_cols())
+
+    if (np>1) then 
+      call op_restr%cscnv(info,type='coo',dupl=psb_dupl_add_)
+      call op_restr%mv_to(acoo)
+      nzl = acoo%get_nzeros()
+      if (info == psb_success_) call psb_glob_to_loc(acoo%ia(1:nzl),p%desc_ac,info,'I')
+      call acoo%set_dupl(psb_dupl_add_)
+      if (info == psb_success_) call op_restr%mv_from(acoo)
+      if (info == psb_success_) call op_restr%cscnv(info,type='csr')        
+      if(info /= psb_success_) then
+        call psb_errpush(psb_err_internal_error_,name,a_err='Converting op_restr to local')
+        goto 9999
+      end if
+    end if
+    call op_restr%set_nrows(p%desc_ac%get_local_cols())
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done ac '
+
+  case(mld_repl_mat_) 
+    !
+    !
+    call psb_cdall(ictxt,p%desc_ac,info,mg=ntaggr,repl=.true.)
+    if (info == psb_success_) call psb_cdasb(p%desc_ac,info)
+    if (info == psb_success_) &
+         & call psb_gather(p%ac,b,p%desc_ac,info,dupl=psb_dupl_add_,keeploc=.false.)
+
+    if (info /= psb_success_) goto 9999
+
+  case default 
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,a_err='invalid mld_coarse_mat_')
+    goto 9999
+  end select
+
+
+
+  call p%ac%cscnv(info,type='csr',dupl=psb_dupl_add_)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='spcnv')
+    goto 9999
+  end if
+
+  !
+  ! Copy the prolongation/restriction matrices into the descriptor map.
+  !  op_restr => PR^T   i.e. restriction  operator
+  !  op_prol => PR     i.e. prolongation operator
+  !  
+
+  p%map = psb_linmap(psb_map_aggr_,desc_a,&
+       & p%desc_ac,op_restr,op_prol,ilaggr,nlaggr)
+  if (info == psb_success_) call op_prol%free()
+  if (info == psb_success_) call op_restr%free()
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_Free')
+    goto 9999
+  end if
+
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'Done smooth_aggregate '
+  call psb_erractionrestore(err_act)
+  return
+
+9999 continue
+  call psb_errpush(info,name)
+  call psb_erractionrestore(err_act)
+  if (err_act.eq.psb_act_abort_) then
+    call psb_error()
+    return
+  end if
+  return
+
+
+
+end subroutine mld_saggrmat_biz_asb
diff --git a/mlprec/impl/mld_zaggrmat_biz_asb.F90 b/mlprec/impl/mld_zaggrmat_biz_asb.F90
new file mode 100644
index 00000000..3f43e05c
--- /dev/null
+++ b/mlprec/impl/mld_zaggrmat_biz_asb.F90
@@ -0,0 +1,523 @@
+!!$ 
+!!$ 
+!!$                           MLD2P4  version 2.0
+!!$  MultiLevel Domain Decomposition Parallel Preconditioners Package
+!!$             based on PSBLAS (Parallel Sparse BLAS version 3.0)
+!!$  
+!!$  (C) Copyright 2008,2009,2010
+!!$
+!!$                      Salvatore Filippone  University of Rome Tor Vergata
+!!$                      Alfredo Buttari      CNRS-IRIT, Toulouse
+!!$                      Pasqua D'Ambra       ICAR-CNR, Naples
+!!$                      Daniela di Serafino  Second University of Naples
+!!$ 
+!!$  Redistribution and use in source and binary forms, with or without
+!!$  modification, are permitted provided that the following conditions
+!!$  are met:
+!!$    1. Redistributions of source code must retain the above copyright
+!!$       notice, this list of conditions and the following disclaimer.
+!!$    2. Redistributions in binary form must reproduce the above copyright
+!!$       notice, this list of conditions, and the following disclaimer in the
+!!$       documentation and/or other materials provided with the distribution.
+!!$    3. The name of the MLD2P4 group or the names of its contributors may
+!!$       not be used to endorse or promote products derived from this
+!!$       software without specific written permission.
+!!$ 
+!!$  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+!!$  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+!!$  TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+!!$  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE MLD2P4 GROUP OR ITS CONTRIBUTORS
+!!$  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+!!$  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+!!$  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+!!$  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+!!$  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+!!$  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+!!$  POSSIBILITY OF SUCH DAMAGE.
+!!$ 
+!!$
+! File: mld_zaggrmat_biz_asb.F90
+!
+! Subroutine: mld_zaggrmat_biz_asb
+! Version:    complex
+!
+!  This routine builds a coarse-level matrix A_C from a fine-level matrix A
+!  by using the Galerkin approach, i.e.
+!
+!                               A_C = P_C^T A P_C,
+!
+!  where P_C is a prolongator from the coarse level to the fine one.
+! 
+!  This routine builds A_C according to a "bizarre" aggregation algorithm,
+!  using a "naive" prolongator proposed by the authors of MLD2P4. However, this
+!  prolongator still requires a deep analysis and testing and its use is not
+!  recommended.
+!
+!  The coarse-level matrix A_C is distributed among the parallel processes or
+!  replicated on each of them, according to the value of p%parms%coarse_mat,
+!  specified by the user through mld_zprecinit and mld_zprecset.
+!
+! Arguments:
+!    a          -  type(psb_zspmat_type), input.     
+!                  The sparse matrix structure containing the local part of
+!                  the fine-level matrix.
+!    desc_a     -  type(psb_desc_type), input.
+!                  The communication descriptor of the fine-level matrix.
+!    p          -  type(mld_z_onelev_type), input/output.
+!                  The 'one-level' data structure that will contain the local
+!                  part of the matrix to be built as well as the information 
+!                  concerning the prolongator and its transpose.
+!    ilaggr     -  integer, dimension(:), allocatable.
+!                  The mapping between the row indices of the coarse-level
+!                  matrix and the row indices of the fine-level matrix.
+!                  ilaggr(i)=j means that node i in the adjacency graph
+!                  of the fine-level matrix is mapped onto node j in the
+!                  adjacency graph of the coarse-level matrix.
+!    nlaggr     -  integer, dimension(:), allocatable.
+!                  nlaggr(i) contains the aggregates held by process i.
+!    info       -  integer, output.
+!                  Error code.
+!
+subroutine mld_zaggrmat_biz_asb(a,desc_a,ilaggr,nlaggr,p,info)
+  use psb_base_mod
+  use mld_z_inner_mod, mld_protect_name => mld_zaggrmat_biz_asb
+
+  implicit none
+
+  ! Arguments
+  type(psb_zspmat_type), intent(in)             :: a
+  type(psb_desc_type), intent(in)               :: desc_a
+  integer, intent(inout)                        :: ilaggr(:), nlaggr(:)
+  type(mld_z_onelev_type), intent(inout), target :: p
+  integer, intent(out)                          :: info
+  type(psb_zspmat_type) :: op_prol, op_restr, b
+
+  ! Local variables
+  integer :: nrow, nglob, ncol, ntaggr, ip, ndx,&
+       & naggr, nzl,naggrm1,naggrp1, i, j, k, jd, icolF, nrw
+  integer ::ictxt, np, me, err_act
+  character(len=20) :: name
+  type(psb_zspmat_type) :: am3, am4
+  type(psb_z_coo_sparse_mat) :: acoo, acoof, bcoo
+  type(psb_z_csr_sparse_mat) :: acsr1, acsr2, acsr3, acsrf, ptilde
+  complex(psb_dpk_), allocatable :: adiag(:)
+  integer(psb_ipk_)  :: ierr(5)
+  logical            :: filter_mat
+  integer            :: debug_level, debug_unit
+  integer, parameter :: ncmax=16
+  real(psb_dpk_)     :: anorm, omega, tmp, dg, theta
+
+  name='mld_aggrmat_biz_asb'
+  if(psb_get_errstatus().ne.0) return 
+  info=psb_success_
+  call psb_erractionsave(err_act)
+  debug_unit  = psb_get_debug_unit()
+  debug_level = psb_get_debug_level()
+
+  ictxt = desc_a%get_context()
+  ictxt = desc_a%get_context()
+
+  call psb_info(ictxt, me, np)
+
+  nglob = desc_a%get_global_rows()
+  nrow  = desc_a%get_local_rows()
+  ncol  = desc_a%get_local_cols()
+
+  theta = p%parms%aggr_thresh
+
+  naggr  = nlaggr(me+1)
+  ntaggr = sum(nlaggr)
+
+  naggrm1 = sum(nlaggr(1:me))
+  naggrp1 = sum(nlaggr(1:me+1))
+
+  filter_mat = (p%parms%aggr_filter == mld_filter_mat_)
+
+  ilaggr(1:nrow) = ilaggr(1:nrow) + naggrm1
+  call psb_halo(ilaggr,desc_a,info)
+
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_halo')
+    goto 9999
+  end if
+
+  ! naggr: number of local aggregates
+  ! nrow: local rows. 
+  ! 
+  allocate(adiag(ncol),stat=info)
+
+  if (info /= psb_success_) then 
+    info=psb_err_alloc_request_; ierr(1)=nrow;
+    call psb_errpush(info,name,i_err=ierr,a_err='complex(psb_dpk_)')
+    goto 9999      
+  end if
+
+  ! Get the diagonal D
+  call a%get_diag(adiag,info)
+  if (info == psb_success_) &
+       & call psb_halo(adiag,desc_a,info)
+
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_getdiag')
+    goto 9999
+  end if
+
+  ! 1. Allocate Ptilde in sparse matrix form 
+  call acoo%allocate(ncol,naggr,ncol)
+  do i=1,nrow
+    acoo%val(i) = zone
+    acoo%ia(i)  = i
+    acoo%ja(i)  = ilaggr(i)  
+  end do
+  call acoo%set_nzeros(nrow)
+  call acoo%set_dupl(psb_dupl_add_)
+
+  call ptilde%mv_from_coo(acoo,info)
+  if (info == psb_success_) call a%cscnv(acsr3,info,dupl=psb_dupl_add_)
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & ' Initial copies sone.'
+
+  if (filter_mat) then
+    !
+    ! Build the filtered matrix Af from A
+    ! 
+    if (info == psb_success_) call a%cscnv(acsrf,info,dupl=psb_dupl_add_)
+
+    do i=1,nrow
+      tmp = zzero
+      jd  = -1 
+      do j=acsrf%irp(i),acsrf%irp(i+1)-1
+        if (acsrf%ja(j) == i) jd = j 
+        if (abs(acsrf%val(j)) < theta*sqrt(abs(adiag(i)*adiag(acsrf%ja(j))))) then
+          tmp=tmp+acsrf%val(j)
+          acsrf%val(j)=zzero
+        endif
+
+      enddo
+      if (jd == -1) then 
+        write(0,*) 'Wrong input: we need the diagonal!!!!', i
+      else
+        acsrf%val(jd)=acsrf%val(jd)-tmp
+      end if
+    enddo
+    ! Take out zeroed terms 
+    call acsrf%mv_to_coo(acoof,info)
+    k = 0
+    do j=1,acoof%get_nzeros()
+      if ((acoof%val(j) /= zzero) .or. (acoof%ia(j) == acoof%ja(j))) then 
+        k = k + 1
+        acoof%val(k) = acoof%val(j)
+        acoof%ia(k)  = acoof%ia(j)
+        acoof%ja(k)  = acoof%ja(j)
+      end if
+    end do
+    call acoof%set_nzeros(k)
+    call acoof%set_dupl(psb_dupl_add_)
+    call acsrf%mv_from_coo(acoof,info)
+  end if
+
+
+  do i=1,size(adiag)
+    if (adiag(i) /= zzero) then
+      adiag(i) = zone / adiag(i)
+    else
+      adiag(i) = zone
+    end if
+  end do
+
+  if (filter_mat) call acsrf%scal(adiag,info)
+  if (info == psb_success_) call acsr3%scal(adiag,info)
+  if (info /= psb_success_) goto 9999
+
+
+  if (p%parms%aggr_omega_alg == mld_eig_est_) then 
+
+    if (p%parms%aggr_eig == mld_max_norm_) then 
+
+      ! 
+      ! This only works with CSR
+      !
+      anorm = dzero
+      dg    = done
+      nrw = acsr3%get_nrows()
+      do i=1, nrw
+        tmp = dzero
+        do j=acsr3%irp(i),acsr3%irp(i+1)-1
+          if (acsr3%ja(j) <= nrw) then 
+            tmp = tmp + abs(acsr3%val(j))
+          endif
+          if (acsr3%ja(j) == i ) then 
+            dg = abs(acsr3%val(j))
+          end if
+        end do
+        anorm = max(anorm,tmp/dg) 
+      enddo
+
+      call psb_amx(ictxt,anorm)     
+      if (info /= psb_success_) then 
+        call psb_errpush(psb_err_internal_error_,name,a_err='Invalid AM3 storage format')
+        goto 9999
+      end if
+      omega = 4.d0/(3.d0*anorm)
+      p%parms%aggr_omega_val = omega 
+
+    else 
+      info = psb_err_internal_error_
+      call psb_errpush(info,name,a_err='invalid mld_aggr_eig_')
+      goto 9999
+    end if
+
+  else if (p%parms%aggr_omega_alg == mld_user_choice_) then 
+
+    omega = p%parms%aggr_omega_val 
+
+  else if (p%parms%aggr_omega_alg /= mld_user_choice_) then 
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,a_err='invalid mld_aggr_omega_alg_')
+    goto 9999
+  end if
+
+  if (filter_mat) then
+    !
+    ! Build the smoothed prolongator using the filtered matrix
+    ! 
+    do i=1,acsrf%get_nrows()
+      do j=acsrf%irp(i),acsrf%irp(i+1)-1
+        if (acsrf%ja(j) == i) then 
+          acsrf%val(j) = zone - omega*acsrf%val(j) 
+        else
+          acsrf%val(j) = - omega*acsrf%val(j) 
+        end if
+      end do
+    end do
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done gather, going for SYMBMM 1'
+    !
+    ! Symbmm90 does the allocation for its result.
+    ! 
+    ! acsrm1 = (I-w*D*Af)Ptilde
+    ! Doing it this way means to consider diag(Af_i)
+    ! 
+    !
+    call psb_symbmm(acsrf,ptilde,acsr1,info)
+    if(info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 1')
+      goto 9999
+    end if
+
+    call psb_numbmm(acsrf,ptilde,acsr1)
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done NUMBMM 1'
+
+  else
+    !
+    ! Build the smoothed prolongator using the original matrix
+    !
+    do i=1,acsr3%get_nrows()
+      do j=acsr3%irp(i),acsr3%irp(i+1)-1
+        if (acsr3%ja(j) == i) then 
+          acsr3%val(j) = zone - omega*acsr3%val(j) 
+        else
+          acsr3%val(j) = - omega*acsr3%val(j) 
+        end if
+      end do
+    end do
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done gather, going for SYMBMM 1'
+    !
+    ! Symbmm90 does the allocation for its result.
+    ! 
+    ! acsrm1 = (I-w*D*A)Ptilde
+    ! Doing it this way means to consider diag(A_i)
+    ! 
+    !
+    call psb_symbmm(acsr3,ptilde,acsr1,info)
+    if(info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 1')
+      goto 9999
+    end if
+
+    call psb_numbmm(acsr3,ptilde,acsr1)
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done NUMBMM 1'
+
+  end if
+  call ptilde%free()
+  call acsr1%set_dupl(psb_dupl_add_)
+
+  call op_prol%mv_from(acsr1)
+
+  call psb_rwextd(ncol,op_prol,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Halo of op_prol')
+    goto 9999
+  end if
+
+  call psb_symbmm(a,op_prol,am3,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='symbmm 2')
+    goto 9999
+  end if
+
+  call psb_numbmm(a,op_prol,am3)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'Done NUMBMM 2',p%parms%aggr_kind, mld_smooth_prol_
+
+  call op_prol%transp(op_restr)
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'starting sphalo/ rwxtd'
+
+  call psb_rwextd(ncol,am3,info)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Extend am3')
+    goto 9999
+  end if
+
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'starting symbmm 3'
+  call psb_symbmm(op_restr,am3,b,info)
+  if (info == psb_success_) call psb_numbmm(op_restr,am3,b)
+  if (info == psb_success_) call am3%free()
+  if (info == psb_success_) call b%cscnv(info,type='coo',dupl=psb_dupl_add_)
+  if (info /= psb_success_) then
+    call psb_errpush(psb_err_internal_error_,name,a_err='Build b = op_restr x am3')
+    goto 9999
+  end if
+
+
+
+
+  select case(p%parms%coarse_mat)
+
+  case(mld_distr_mat_) 
+
+    nzl = b%get_nzeros()
+    call b%mv_to(bcoo)
+
+    if (info == psb_success_) call psb_cdall(ictxt,p%desc_ac,info,nl=nlaggr(me+1))
+    if (info == psb_success_) call psb_cdins(nzl,bcoo%ia,bcoo%ja,p%desc_ac,info)
+    if (info == psb_success_) call psb_cdasb(p%desc_ac,info)
+    if (info == psb_success_) call psb_glob_to_loc(bcoo%ia(1:nzl),p%desc_ac,info,iact='I')
+    if (info == psb_success_) call psb_glob_to_loc(bcoo%ja(1:nzl),p%desc_ac,info,iact='I')
+    if (info /= psb_success_) then
+      call psb_errpush(psb_err_internal_error_,name,&
+           & a_err='Creating p%desc_ac and converting ac')
+      goto 9999
+    end if
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Assembld aux descr. distr.'
+    call p%ac%mv_from(bcoo)
+
+    call p%ac%set_nrows(p%desc_ac%get_local_rows())
+    call p%ac%set_ncols(p%desc_ac%get_local_cols())
+    call p%ac%set_asb()
+
+    if (info /= psb_success_) then
+      call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_sp_free')
+      goto 9999
+    end if
+
+    if (np>1) then 
+      call op_prol%mv_to(acsr1)
+      nzl = acsr1%get_nzeros()
+      call psb_glob_to_loc(acsr1%ja(1:nzl),p%desc_ac,info,'I')
+      if(info /= psb_success_) then
+        call psb_errpush(psb_err_from_subroutine_,name,a_err='psb_glob_to_loc')
+        goto 9999
+      end if
+      call op_prol%mv_from(acsr1)
+    endif
+    call op_prol%set_ncols(p%desc_ac%get_local_cols())
+
+    if (np>1) then 
+      call op_restr%cscnv(info,type='coo',dupl=psb_dupl_add_)
+      call op_restr%mv_to(acoo)
+      nzl = acoo%get_nzeros()
+      if (info == psb_success_) call psb_glob_to_loc(acoo%ia(1:nzl),p%desc_ac,info,'I')
+      call acoo%set_dupl(psb_dupl_add_)
+      if (info == psb_success_) call op_restr%mv_from(acoo)
+      if (info == psb_success_) call op_restr%cscnv(info,type='csr')        
+      if(info /= psb_success_) then
+        call psb_errpush(psb_err_internal_error_,name,a_err='Converting op_restr to local')
+        goto 9999
+      end if
+    end if
+    call op_restr%set_nrows(p%desc_ac%get_local_cols())
+
+    if (debug_level >= psb_debug_outer_) &
+         & write(debug_unit,*) me,' ',trim(name),&
+         & 'Done ac '
+
+  case(mld_repl_mat_) 
+    !
+    !
+    call psb_cdall(ictxt,p%desc_ac,info,mg=ntaggr,repl=.true.)
+    if (info == psb_success_) call psb_cdasb(p%desc_ac,info)
+    if (info == psb_success_) &
+         & call psb_gather(p%ac,b,p%desc_ac,info,dupl=psb_dupl_add_,keeploc=.false.)
+
+    if (info /= psb_success_) goto 9999
+
+  case default 
+    info = psb_err_internal_error_
+    call psb_errpush(info,name,a_err='invalid mld_coarse_mat_')
+    goto 9999
+  end select
+
+
+
+  call p%ac%cscnv(info,type='csr',dupl=psb_dupl_add_)
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='spcnv')
+    goto 9999
+  end if
+
+  !
+  ! Copy the prolongation/restriction matrices into the descriptor map.
+  !  op_restr => PR^T   i.e. restriction  operator
+  !  op_prol => PR     i.e. prolongation operator
+  !  
+
+  p%map = psb_linmap(psb_map_aggr_,desc_a,&
+       & p%desc_ac,op_restr,op_prol,ilaggr,nlaggr)
+  if (info == psb_success_) call op_prol%free()
+  if (info == psb_success_) call op_restr%free()
+  if(info /= psb_success_) then
+    call psb_errpush(psb_err_from_subroutine_,name,a_err='sp_Free')
+    goto 9999
+  end if
+
+
+  if (debug_level >= psb_debug_outer_) &
+       & write(debug_unit,*) me,' ',trim(name),&
+       & 'Done smooth_aggregate '
+  call psb_erractionrestore(err_act)
+  return
+
+9999 continue
+  call psb_errpush(info,name)
+  call psb_erractionrestore(err_act)
+  if (err_act.eq.psb_act_abort_) then
+    call psb_error()
+    return
+  end if
+  return
+
+
+
+end subroutine mld_zaggrmat_biz_asb