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@article{IM_1986__84_143349, author = {J.-H. Eschenburg}, title = {Local convexity and nonnegative curvature - {Gromov's} proof of the sphere theorem.}, journal = {Inventiones mathematicae}, pages = {507--522}, publisher = {mathdoc}, volume = {84}, year = {1986}, zbl = {0594.53034}, url = {http://geodesic.mathdoc.fr/item/IM_1986__84_143349/} }
J.-H. Eschenburg. Local convexity and nonnegative curvature - Gromov's proof of the sphere theorem.. Inventiones mathematicae, Tome 84 (1986), pp. 507-522. http://geodesic.mathdoc.fr/item/IM_1986__84_143349/