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@article{DE_1976_12_2_a1, author = {G. M. Buldyk}, title = {The limit cycles of a certain differential equation}, journal = {Differencialʹnye uravneni\^a}, pages = {200--205}, publisher = {mathdoc}, volume = {12}, number = {2}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1976_12_2_a1/} }
G. M. Buldyk. The limit cycles of a certain differential equation. Differencialʹnye uravneniâ, Tome 12 (1976) no. 2, pp. 200-205. http://geodesic.mathdoc.fr/item/DE_1976_12_2_a1/