\begin{thebibliography}{Sch87}

\bibitem[KV00]{Kort1}
B.~Korte and J.~Vygen.
\newblock {\em Combinatorial Optimization}.
\newblock Number~21 in Algorithms and Combinatorics. Springer-Verlag, New York,
  2000.

\bibitem[Lee04]{JonLee1}
Jon Lee.
\newblock {\em A First Course in Combinatorial Optimization}.
\newblock Cambridge University Press, $1^{st}$ edition, 2004.

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

\end{thebibliography}
