@article{DAN_1968_180_1_a4,
     author = {V. M. Krasnosel'skii},
     title = {Investigation of small solutions of a certain class of nonlinear operator equations},
     journal = {Doklady Akademii Nauk},
     pages = {22--24},
     publisher = {mathdoc},
     volume = {180},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_180_1_a4/}
}