Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1975_225_1_a12, author = {V. R. Portnov}, title = {On the solvability of nonlinear operator equations in {Banach} spaces}, journal = {Doklady Akademii Nauk}, pages = {52--55}, publisher = {mathdoc}, volume = {225}, number = {1}, year = {1975}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1975_225_1_a12/} }
V. R. Portnov. On the solvability of nonlinear operator equations in Banach spaces. Doklady Akademii Nauk, Tome 225 (1975) no. 1, pp. 52-55. http://geodesic.mathdoc.fr/item/DAN_1975_225_1_a12/