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\bibitem{Snow+Gimber2007} Snow, J. T., \& Gimber, A. (2007). Richard Strauss, Stefan Zweig, Joseph Gregor and the Story of the Celestina Opera that Almost was, with a Bibliographical Appendix of {\textquotedblleft}Celestina{\textquotedblright} Operas in the Twentieth Century. \textit{Celestinesca}, 31, 133--164.

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