Periodic solutions of second-order nonlinear equations
Differencialʹnye uravneniâ, Tome 3 (1967) no. 11, pp. 1903-1912.

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@article{DE_1967_3_11_a6,
     author = {A. M. Samoilenko},
     title = {Periodic solutions of second-order nonlinear equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1903--1912},
     publisher = {mathdoc},
     volume = {3},
     number = {11},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1967_3_11_a6/}
}
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A. M. Samoilenko. Periodic solutions of second-order nonlinear equations. Differencialʹnye uravneniâ, Tome 3 (1967) no. 11, pp. 1903-1912. http://geodesic.mathdoc.fr/item/DE_1967_3_11_a6/