MathSciNet bibliographic data MR458336 (56 #16539) 53C20 (32F99 32C05) Greene, R. E.; Wu, H. $C\sp{\infty }$$C\sp{\infty }$ convex functions and manifolds of positive curvature. Acta Math. 137 (1976), no. 3-4, 209–245. Article

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