@article{MZM_1971_10_5_a8,
     author = {V. I. Ovchinnikov},
     title = {On a~problem in the theory of nonlinear {Fredholm} operators},
     journal = {Matemati\v{c}eskie zametki},
     pages = {541--549},
     publisher = {mathdoc},
     volume = {10},
     number = {5},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_5_a8/}
}