\section{Code Distribution\label{sec:distribution}} \markboth{\textsc{AMG4PSBLAS User's and Reference Guide}} {\textsc{\ref{sec:distribution} Code Distribution}} \noindent AMG4PSBLAS is available from the web site \begin{quotation} \href{https://psctoolkit.github.io/products/amg4psblas/}{https://psctoolkit.github.io/products/amg4psblas/} \end{quotation} where contact points for further information can be also found. The software is available under a modified BSD license, as specified in Appendix~\ref{sec:license}; please note that some of the optional third party libraries may be licensed under a different and more stringent license, most notably the GPL, and this should be taken into account when treating derived works. The library defines a version string with the constant \[ \verb|amg_version_string_|\] whose current value is \verb|1.0|. \subsection*{Contributors} \begin{itemize} \item Pasqua D'Ambra, IAC-CNR, IT; \item Fabio Durastante, University of Pisa and IAC-CNR, IT; \item Salvatore Filippone, University of Rome Tor-Vergata and IAC-CNR, IT; \end{itemize}