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Research supported by the “Sonderforschungsbereich Theoretische Mathematik (SFB 40)” at the University of Bonn.
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Poor, W.A. Some exotic spheres with positive Ricci curvature. Math. Ann. 216, 245–252 (1975). https://doi.org/10.1007/BF01430964
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DOI: https://doi.org/10.1007/BF01430964