Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1971_196_1_a1, author = {Yu. G. Borisovich and Yu. I. Sapronov}, title = {On some topological invariants of nonlinear {Fredholm} mappings}, journal = {Doklady Akademii Nauk}, pages = {12--15}, publisher = {mathdoc}, volume = {196}, number = {1}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1971_196_1_a1/} }
Yu. G. Borisovich; Yu. I. Sapronov. On some topological invariants of nonlinear Fredholm mappings. Doklady Akademii Nauk, Tome 196 (1971) no. 1, pp. 12-15. http://geodesic.mathdoc.fr/item/DAN_1971_196_1_a1/