\begin{thebibliography}{CLRS01}

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

\bibitem[Mot92]{motwani:approximate}
R.~Motwani.
\newblock Lecture notes on approximation algorithms: Volume {I}.
\newblock Technical Report STAN-CS-92-1435, Department of Computer Science,
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\newblock Postscript document is available at\\
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\bibitem[Nie06]{niedermeier:fixed_parameter}
R.~Niedermeier, editor.
\newblock {\em Invitation to Fixed-Parameter Algorithms}.
\newblock Oxford University Press, 2006.

\bibitem[Vaz03]{vazirani:approximateBook}
V.~Vazirani.
\newblock {\em Approximation Algorithms}.
\newblock Springer-Verlag, 2003.

\end{thebibliography}