@article{urn:eudml:doc:39473, title = {On totally umbilical submanifolds of a locally Minkowski manifold.}, journal = {Collectanea Mathematica}, volume = {43}, year = {1992}, pages = {151-175}, zbl = {0784.53010}, mrnumber = {MR1223418}, language = {en}, url = {http://dml.mathdoc.fr/item/urn:eudml:doc:39473} }
Abatangelo, L. Maria. On totally umbilical submanifolds of a locally Minkowski manifold.. Collectanea Mathematica, Tome 43 (1992) pp. 151-175. http://gdmltest.u-ga.fr/item/urn:eudml:doc:39473/