@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/}
}