@article{GDZPPN002228297,
title = {Comparison theorems and hypersurfaces.},
journal = {Manuscripta mathematica},
volume = {58},
year = {1987},
pages = {295-324},
zbl = {0642.53044},
url = {http://dml.mathdoc.fr/item/GDZPPN002228297}
}
Eschenburg, J.-H. Comparison theorems and hypersurfaces.. Manuscripta mathematica, Tome 58 (1987) pp. 295-324. http://gdmltest.u-ga.fr/item/GDZPPN002228297/