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@article{DE_1984_20_5_a28, author = {N. P. Morozov}, title = {On periodic solutions of a system of equations}, journal = {Differencialʹnye uravneni\^a}, pages = {904--905}, publisher = {mathdoc}, volume = {20}, number = {5}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1984_20_5_a28/} }
N. P. Morozov. On periodic solutions of a system of equations. Differencialʹnye uravneniâ, Tome 20 (1984) no. 5, pp. 904-905. http://geodesic.mathdoc.fr/item/DE_1984_20_5_a28/