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@article{DE_1970_6_10_a9, author = {Yu. K. Metlyaev}, title = {The periodic solutions of a certain differential equation}, journal = {Differencialʹnye uravneni\^a}, pages = {1824--1830}, publisher = {mathdoc}, volume = {6}, number = {10}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1970_6_10_a9/} }
Yu. K. Metlyaev. The periodic solutions of a certain differential equation. Differencialʹnye uravneniâ, Tome 6 (1970) no. 10, pp. 1824-1830. http://geodesic.mathdoc.fr/item/DE_1970_6_10_a9/