\begin{thebibliography}{CLRS01}

\bibitem[CLRS01]{CLRS01}
T.~H. Cormen, C.~E. Leiserson, R.~L. Rivest, and C.~Stein.
\newblock {\em Introduction to Algorithms.}
\newblock MIT Press, 2001.

\bibitem[GJ79]{Garey}
M.~R. Garey and D.~S. Johnson.
\newblock {\em Computers and Intractability: A Guide to the Theory of
  NP-Completeness}.
\newblock W. H. Freeman Company, San Francisco, 1979.

\bibitem[Wil02]{Wilf1}
Herbert~S. Wilf.
\newblock {\em Algorithms and Complexity}.
\newblock A K Peters, Ltd., 2002.

\end{thebibliography}
