Modified copyright vs contribution.

docs/src/distribution.tex

@@ -18,4 +18,20 @@ account when treating derived works.
 The library defines a version string with the
 constant 
 \[ \verb|mld_version_string_|\]
-whose current value is \verb|2.1.0|
+whose current value is \verb|2.1.0|.
+
+\subsection*{Contributors}
+Contributors to version 2:
+\begin{itemize}
+\item Salvatore  Filippone,          Cranfield University, UK;				
+\item Pasqua     D'Ambra,            IAC-CNR, Naples, IT;				
+\item Daniela    di Serafino,        University of Campania ``L. Vanvitelli'', Caserta, IT;
+\item Ambra	 Abdullahi Hassan, University of Rome ``Tor Vergata'', IT.
+\end{itemize}
+Contributors to version 1:
+\begin{itemize}
+\item Salvatore  Filippone;
+\item Pasqua     D'Ambra;
+\item Daniela    di Serafino;
+\item Alfredo    Buttari, CNRS-IRIT, Toulouse, F. 
+\end{itemize}