\begin{thebibliography}{{Led}09}

\bibitem[{Led}09]{2009arXiv0910.1425L}
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\newblock {Linear drift and entropy for regular covers}.
\newblock {\em ArXiv e-prints}, October 2009.

\bibitem[{Les}10]{2010arXiv1001.0053L}
P.~{Lessa}.
\newblock {Rotation Vectors for Homeomorphisms of Non-Positively Curved
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\newblock {\em ArXiv e-prints}, December 2010.

\end{thebibliography}
