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@article{MAN_1994__298_2_165169, author = {Luis A. Florit}, title = {On submanifolds with nonpositive extrinsic curvature.}, journal = {Mathematische Annalen}, pages = {187--192}, publisher = {mathdoc}, volume = {298}, number = {2}, year = {1994}, zbl = {0810.53011}, url = {http://geodesic.mathdoc.fr/item/MAN_1994__298_2_165169/} }
Luis A. Florit. On submanifolds with nonpositive extrinsic curvature.. Mathematische Annalen, Tome 298 (1994) no. 2, pp. 187-192. http://geodesic.mathdoc.fr/item/MAN_1994__298_2_165169/