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@article{DE_1971_7_5_a1, author = {L. I. Zhilevich}, title = {The separatrices and limit cycles of certain differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {782--790}, publisher = {mathdoc}, volume = {7}, number = {5}, year = {1971}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1971_7_5_a1/} }
L. I. Zhilevich. The separatrices and limit cycles of certain differential equations. Differencialʹnye uravneniâ, Tome 7 (1971) no. 5, pp. 782-790. http://geodesic.mathdoc.fr/item/DE_1971_7_5_a1/