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% \MRhref is called by the amsart/book/proc definition of \MR.
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\begin{thebibliography}{Fra03}

\bibitem[Fra03]{fraleigh}
John Fraleigh, \emph{A {F}irst {C}ourse in {A}bstract {A}lgebra}, Seventh
  edition, Addison Wesley, Pearson, 2003.

\end{thebibliography}
