@article{1138845504,
author = {Watanabe, Yoshiko},
title = {Totally umbilical surfaces in normal contact Riemannian manifolds},
journal = {Kodai Math. Sem. Rep.},
volume = {19},
number = {1},
year = {1967},
pages = { 474-487},
language = {en},
url = {http://dml.mathdoc.fr/item/1138845504}
}
Watanabe, Yoshiko. Totally umbilical surfaces in normal contact Riemannian manifolds. Kodai Math. Sem. Rep., Tome 19 (1967) no. 1, pp. 474-487. http://gdmltest.u-ga.fr/item/1138845504/