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Research supported by the National Science Foundation, the Institute for Advanced Study and an Alfred P. Sloan Foundation Fellowship (Greene), and by the University of California, Los Angeles (both authors) and by the Sonderforschungsbereich Theoretische Mathematik, Universität Bonn (both authors)
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Greene, R.E., Shiohama, K. Convex functions on complete noncompact manifolds: Topological structure. Invent Math 63, 129–157 (1981). https://doi.org/10.1007/BF01389196
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DOI: https://doi.org/10.1007/BF01389196