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% \MRhref is called by the amsart/book/proc definition of \MR.
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\begin{thebibliography}{Tat74}

\bibitem[Tat74]{tate:arithmetic}
John~T. Tate, \emph{The arithmetic of elliptic curves}, Invent. Math.
  \textbf{23} (1974), 179--206. \MR{54 \#7380}

\end{thebibliography}
