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@article{DE_1982_18_10_a2, author = {A. A. Zevin}, title = {Estimates of periodic solutions of second-order nonlinear differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {1673--1679}, publisher = {mathdoc}, volume = {18}, number = {10}, year = {1982}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1982_18_10_a2/} }
A. A. Zevin. Estimates of periodic solutions of second-order nonlinear differential equations. Differencialʹnye uravneniâ, Tome 18 (1982) no. 10, pp. 1673-1679. http://geodesic.mathdoc.fr/item/DE_1982_18_10_a2/