Voir la notice de l'article provenant de la source Math-Net.Ru
@article{IVM_1974_5_a18, author = {\"U. G. Lumiste and A. V. Chakmazyan}, title = {Submanifolds with parallel normal vector field}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {148--157}, publisher = {mathdoc}, number = {5}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1974_5_a18/} }
Ü. G. Lumiste; A. V. Chakmazyan. Submanifolds with parallel normal vector field. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 5 (1974), pp. 148-157. http://geodesic.mathdoc.fr/item/IVM_1974_5_a18/