Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1991_316_2_a7, author = {A. V. Pogorelov}, title = {On a theorem of {Beltrami}}, journal = {Doklady Akademii Nauk}, pages = {297--299}, publisher = {mathdoc}, volume = {316}, number = {2}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1991_316_2_a7/} }
A. V. Pogorelov. On a theorem of Beltrami. Doklady Akademii Nauk, Tome 316 (1991) no. 2, pp. 297-299. http://geodesic.mathdoc.fr/item/DAN_1991_316_2_a7/