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% \MRhref is called by the amsart/book/proc definition of \MR.
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\begin{thebibliography}{1}

\bibitem{Chao93}
Alexander~Wu Chao, \emph{Physics of collective beam instabilities in high
  energy accelerators}, Interscience, New York, 1993.

\bibitem{StupakovJAS2002}
G.Stupakov, \emph{Wakefields and instubilities in linacs},  (2002).

\bibitem{YokoyaGenCross93}
K.~Yokoya, \emph{Resistive wall impedance of beam pipes of general cross
  section},  (1993).

\end{thebibliography}