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@article{DAN_1984_276_6_a18, author = {A. M. Krasnosel'skii}, title = {On forced periodic oscillations in the nonlinear systems}, journal = {Doklady Akademii Nauk}, pages = {1356--1359}, publisher = {mathdoc}, volume = {276}, number = {6}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1984_276_6_a18/} }
A. M. Krasnosel'skii. On forced periodic oscillations in the nonlinear systems. Doklady Akademii Nauk, Tome 276 (1984) no. 6, pp. 1356-1359. http://geodesic.mathdoc.fr/item/DAN_1984_276_6_a18/