Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1973_209_2_a5, author = {S. E. Karapetyan}, title = {Topology of asymptotic lines on closed linear surfaces}, journal = {Doklady Akademii Nauk}, pages = {283--286}, publisher = {mathdoc}, volume = {209}, number = {2}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1973_209_2_a5/} }
S. E. Karapetyan. Topology of asymptotic lines on closed linear surfaces. Doklady Akademii Nauk, Tome 209 (1973) no. 2, pp. 283-286. http://geodesic.mathdoc.fr/item/DAN_1973_209_2_a5/