@article{1273779886,
author = {ASO, Kazutoshi and YOROZU, Shinsuke},
title = {A generalization of Clairaut' s theorem and umbilical foliations},
journal = {Nihonkai Math. J.},
volume = {2},
number = {1},
year = {1991},
pages = { 139-153},
language = {en},
url = {http://dml.mathdoc.fr/item/1273779886}
}
ASO, Kazutoshi; YOROZU, Shinsuke. A generalization of Clairaut' s theorem and umbilical foliations. Nihonkai Math. J., Tome 2 (1991) no. 1, pp. 139-153. http://gdmltest.u-ga.fr/item/1273779886/