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This research was sponsored in part by the Office of Naval Research under Contract No. N00014-76-C-0300, by the U.S. Army under Contract No. DAAG2-75-C-0024, and in part by the National Science Foundation under Grant No. NSF MCS76-06373. Any reproduction in part or in full for the purposes of the U.S. Government is permitted
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Fadell, E.R., Rabinowitz, P.H. Generalized cohomological index theories for Lie group actions with an application to bifurcation questions for Hamiltonian systems. Invent Math 45, 139–174 (1978). https://doi.org/10.1007/BF01390270
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DOI: https://doi.org/10.1007/BF01390270