@article{1077375643,
author = {O'Neill, Barrett},
title = {Umbilics of constant curvature immersions},
journal = {Duke Math. J.},
volume = {32},
number = {1},
year = {1965},
pages = { 149-159},
language = {en},
url = {http://dml.mathdoc.fr/item/1077375643}
}
O’Neill, Barrett. Umbilics of constant curvature immersions. Duke Math. J., Tome 32 (1965) no. 1, pp. 149-159. http://gdmltest.u-ga.fr/item/1077375643/