@article{1206454435,
author = {Cheng, Qing Ming and Nakagawa, Hisao},
title = {Totally umbilic hypersurfaces},
journal = {Hiroshima Math. J.},
volume = {20},
number = {3},
year = {1990},
pages = { 1-10},
language = {en},
url = {http://dml.mathdoc.fr/item/1206454435}
}
Cheng, Qing Ming; Nakagawa, Hisao. Totally umbilic hypersurfaces. Hiroshima Math. J., Tome 20 (1990) no. 3, pp. 1-10. http://gdmltest.u-ga.fr/item/1206454435/