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@article{DE_1983_19_2_a18, author = {Yu. Knezhevich}, title = {Construction of periodic solutions of ordinary differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {362--364}, publisher = {mathdoc}, volume = {19}, number = {2}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1983_19_2_a18/} }
Yu. Knezhevich. Construction of periodic solutions of ordinary differential equations. Differencialʹnye uravneniâ, Tome 19 (1983) no. 2, pp. 362-364. http://geodesic.mathdoc.fr/item/DE_1983_19_2_a18/