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Supported in part by a grant from the National Science Foundation.
Research supported in part by a grant from the National Science and Engineering Research Council.
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Grove, K., Halperin, S. Elliptic isometries, condition (C) and proper maps. Arch. Math 56, 288–299 (1991). https://doi.org/10.1007/BF01190218
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DOI: https://doi.org/10.1007/BF01190218