TY  - JOUR
AU  - J.-H. Eschenburg
TI  - Local convexity and nonnegative curvature - Gromov's proof of the sphere theorem.
JO  - Inventiones mathematicae
PY  - 1986
SP  - 507
EP  - 522
VL  - 84
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1986__84_143349/
ID  - IM_1986__84_143349
ER  -