%0 Journal Article
%A J.-H. Eschenburg
%T Local convexity and nonnegative curvature - Gromov's proof of the sphere theorem.
%J Inventiones mathematicae
%D 1986
%P 507-522
%V 84
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1986__84_143349/
%F IM_1986__84_143349