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@article{MM2_1987__59_155252, author = {J.-H. Eschenburg}, title = {Comparison theorems and hypersurfaces.}, journal = {Manuscripta mathematica}, pages = {295--324}, publisher = {mathdoc}, volume = {59}, year = {1987}, zbl = {0642.53044}, url = {http://geodesic.mathdoc.fr/item/MM2_1987__59_155252/} }
J.-H. Eschenburg. Comparison theorems and hypersurfaces.. Manuscripta mathematica, Tome 59 (1987), pp. 295-324. http://geodesic.mathdoc.fr/item/MM2_1987__59_155252/