\begin{thebibliography}{Br{\'e}94}

\bibitem[Br{\'e}94]{brezis}
Ha{\"{\i}}m Br{\'e}zis.
\newblock {\em Analyse fonctionnelle. {Th{\'e}orie} et applications}.
\newblock Paris: Masson, 1994.

\end{thebibliography}
