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@article{DE_1966_2_6_a5, author = {M. T. Terekhin}, title = {Periodic solutions of a certain nonautonomous system of differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {778--782}, publisher = {mathdoc}, volume = {2}, number = {6}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1966_2_6_a5/} }
M. T. Terekhin. Periodic solutions of a certain nonautonomous system of differential equations. Differencialʹnye uravneniâ, Tome 2 (1966) no. 6, pp. 778-782. http://geodesic.mathdoc.fr/item/DE_1966_2_6_a5/