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% \bibitem{bur97}
%   W. Burnside.
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% \bibitem{dil50}
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% \bibitem{dir52}
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% \bibitem{hal35}
%   P. Hall.
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\bibitem{iois}
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% \bibitem{kon31}
%   D. Kőnig.
%   Gráfok és mátrixok.
%   \emph{Matematikai és Fizikai Lapok}, 38(1):116--119, 1931.

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% \bibitem{ore60}
%   Ø. Ore.
%   Note on Hamilton circuits.
%   \emph{The American Mathematical Monthly}, 67(1):55, 1960.

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% \bibitem{pic99}
%   G. Pick.
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%   \emph{Sitzungsberichte des deutschen naturwissenschaftlich-medicinischen Vereines
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% \bibitem{pru18}
%   H. Prüfer.
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% \bibitem{zec72}
%   E. Zeckendorf.
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\end{thebibliography}