\appendix
\section<presentation>*{\appendixname}
\subsection<presentation>*{References}

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  \frametitle<presentation>{References}
{\tiny
  \begin{thebibliography}{10}

        \bibitem{NPC}
        M.R.Garey, D.S.Johnson:
        \newblock Computers and Tractability, A guide to the theory of NP-Completeness.
        \newblock Freeman and Company, New York (1979)

        \bibitem{akkaya}
        McLaughlan, B., Akkaya, K.:
        \newblock Coverage-based clustering of wireless sensor and actor networks.
        \newblock In: Proceedings International Conference on Pervasive Services. (2007)  45--54

        \bibitem{gerla}
        Lin, C.R., Gerla, M.:
        \newblock Adaptive clustering for mobile wireless networks.
        \newblock IEEE Journal on Selected Areas in Communications, Vol. 15, No. 7  (1997)  1265--1275

        \bibitem{survey1}
        Kayhan Erciyes, Orhan Dagdeviren, Deniz Cokuslu, and Deniz Ozsoyeller:
        \newblock {G}raph {T}heoretic {C}lustering {A}lgorithms in {M}obile {A}d
        {H}oc {N}etworks and {W}ireless {S}ensor {N}etworks.
        \newblock Appl. Comput. Math., no. 2, pages 162--180, 2007.

        \bibitem{skel-www}
        Robert Fisher:
        \newblock Image Processing Learning Resources.
        \newblock \url{http://homepages.inf.ed.ac.uk/rbf/HIPR2/thin.htm}.


 \end{thebibliography}
}
\end{frame}


