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Partially supported by NSF Grant MC 80-23356 while visiting the University of California at Berkeley, U.S.A.
Supported in part by the Netherlands Organization for the Advancement of Pure Research (Z.W.O.)
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Duistermaat, J.J., Heckman, G.J. On the variation in the cohomology of the symplectic form of the reduced phase space. Invent Math 69, 259–268 (1982). https://doi.org/10.1007/BF01399506
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DOI: https://doi.org/10.1007/BF01399506