Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MZM_1994_56_6_a14, author = {V. A. Krasnov}, title = {Two-sheeted coverings of real algebraic surfaces}, journal = {Matemati\v{c}eskie zametki}, pages = {137--140}, publisher = {mathdoc}, volume = {56}, number = {6}, year = {1994}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1994_56_6_a14/} }
V. A. Krasnov. Two-sheeted coverings of real algebraic surfaces. Matematičeskie zametki, Tome 56 (1994) no. 6, pp. 137-140. http://geodesic.mathdoc.fr/item/MZM_1994_56_6_a14/