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This work was done under the program “Sonderforschungsbereich Theoretische Mathematik” (SFB 40) at the University of Bonn.
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Grove, K., Karcher, H. & Ruh, E.A. Group actions and curvature. Invent Math 23, 31–48 (1974). https://doi.org/10.1007/BF01405201
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DOI: https://doi.org/10.1007/BF01405201