Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1974_219_1_a2, author = {R. M. Geidel'man and L. Z. Kruglyakov}, title = {On planar surfaces}, journal = {Doklady Akademii Nauk}, pages = {19--22}, publisher = {mathdoc}, volume = {219}, number = {1}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1974_219_1_a2/} }
R. M. Geidel'man; L. Z. Kruglyakov. On planar surfaces. Doklady Akademii Nauk, Tome 219 (1974) no. 1, pp. 19-22. http://geodesic.mathdoc.fr/item/DAN_1974_219_1_a2/