\begin{thebibliography}{NW99}

\bibitem[NW99]{ipm:Nemhauser1}
G.~L. Nemhauser and L.~A. Wolsey.
\newblock {\em Integer and Combinatorial Optimization}.
\newblock John Wiley\,\&\,Sons, New York, 1999.

\bibitem[Sch87]{Sch:theory}
Alexander Schrijver.
\newblock {\em Theory of Linear and Integer Programming}.
\newblock John Wiley and Sons, New York, 1987.

\end{thebibliography}
