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% \MRhref is called by the amsart/book/proc definition of \MR.
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\begin{thebibliography}{Rib92}

\bibitem[Rib92]{ribet:abvars}
K.\thinspace{}A. Ribet, \emph{Abelian varieties over {${\bf Q}$} and modular
  forms}, Algebra and topology 1992 (Taej\u on), Korea Adv. Inst. Sci. Tech.,
  Taej\u on, 1992, pp.~53--79. \MR{94g:11042}

\bibitem[Ser87]{serre:conjectures}
J-P. Serre, \emph{Sur les repr\'esentations modulaires de degr\'e \protect{$2$}
  de \protect{${\rm{G}al}(\overline{\bf {Q}}/{\bf {Q}})$}}, Duke Math. J.
  \textbf{54} (1987), no.~1, 179--230.

\end{thebibliography}
