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Research supported by Sonderforschungsbereich Theoretische Mathematik (SFB 40) at the University of Bonn
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Ballmann, W. Axial isometries of manifolds of non-positive curvature. Math. Ann. 259, 131–144 (1982). https://doi.org/10.1007/BF01456836
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DOI: https://doi.org/10.1007/BF01456836