\begin{thebibliography}{BGLS03}

\bibitem[BGLS03]{optimNum}
Joseph~Fr\'ed\'eric Bonnans, Jean-Charles Gilbert, Claude Lemar\'echal, and
  Claudia Sagastizabal.
\newblock {\em Numerical Optimization : Theoritical and Practical Aspects}.
\newblock Springer, Collection, 2003.

\bibitem[BMP04]{objAgr}
Vincent Beck, J\'er\^ome Malick, and Gabriel Peyr\'e.
\newblock {\em Objectif Agr\'egation}.
\newblock H-K, 2004.

\bibitem[Fle87]{fletcher}
Roger Fletcher.
\newblock {\em Practical Methods of Optimization, Second Edition}.
\newblock John Wiley and Sons, 1987.

\bibitem[HU01]{optim}
Jean-Baptiste Hiriart-Urruty.
\newblock {\em Optimisation}.
\newblock Que sais-je ?, 2001.

\end{thebibliography}