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## Optional third party libraries

We provide interfaces to the following third-party software libraries; note that these are optional, but if you enable them some defaults for multilevel preconditioners may change to reflect their presence.

UMFPACK
  [9] A sparse direct factorization package available from
  `http://www.cise.ufl.edu/research/sparse/umfpack/`; provides serial factorization and triangular system solution for double precision real and complex data. We have tested versions 5.4.
SuperLU
  [10] A sparse direct factorization package available from
  `http://crd.lbl.gov/~xiaoye/SuperLU/`; provides serial factorization and triangular system solution for single and double precision, real and complex data. We have tested version 4.3.