\begin{thebibliography}{APR01}

\bibitem[APR01]{GPL}
APRIL.
\newblock {\em La license GPL, traduit en francais}, 09 2001.
\newblock http://www.april.org/gnu/gpl\_french.html.

\bibitem[Per]{OPENSOURCE}
Bruce Perrens.
\newblock {\em Open source definition}.
\newblock http://www.opensource.org/docs/definition.html.

\end{thebibliography}