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% \MRhref is called by the amsart/book/proc definition of \MR.
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\begin{thebibliography}{Nor98}

\bibitem[Nor98]{MR1600720}
J.~R. Norris, \emph{Markov chains}, Cambridge Series in Statistical and
  Probabilistic Mathematics, vol.~2, Cambridge University Press, Cambridge,
  1998, Reprint of 1997 original. \MR{1600720 (99c:60144)}

\end{thebibliography}
