\begin{thebibliography}{}
\itemsep0pt

\bibitem[Sava and Biondi, 2004a]{sava2004a}
Sava, P. and B. Biondi,  2004a, Wave-equation migration velocity analysis-{I}:
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\bibitem[Sava and Biondi, 2004b]{sava2004b}
--------, 2004b, Wave-equation migration velocity analysis-{II}: {E}xamples:
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\bibitem[Shen and Symes, 2008]{shen:VE49}
Shen, P. and W.~W. Symes,  2008, Automatic velocity analysis via shot profile
  migration: Geophysics, {\bf 73}, VE49--VE59.

\end{thebibliography}
