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% \MRhref is called by the amsart/book/proc definition of \MR.
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\begin{thebibliography}{CES03}

\bibitem[CES03]{conrad-edixhoven-stein:j1p}
B.~Conrad, S.~Edixhoven, and W.\thinspace{}A. Stein, \emph{${J}_1(p)$ {H}as
  {C}onnected {F}ibers}, Documenta Mathematica \textbf{8} (2003), 331--408.

\end{thebibliography}