Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1960_130_4_a1, author = {A. M. Vinogradov}, title = {On the second obstruction to cross-sections}, journal = {Doklady Akademii Nauk}, pages = {723--725}, publisher = {mathdoc}, volume = {130}, number = {4}, year = {1960}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1960_130_4_a1/} }
A. M. Vinogradov. On the second obstruction to cross-sections. Doklady Akademii Nauk, Tome 130 (1960) no. 4, pp. 723-725. http://geodesic.mathdoc.fr/item/DAN_1960_130_4_a1/