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@article{DE_1972_8_7_a6, author = {L. A. Cherkas and L. I. Zhilevich}, title = {The limit cycles of certain differential equations}, journal = {Differencialʹnye uravneni\^a}, pages = {1207--1213}, publisher = {mathdoc}, volume = {8}, number = {7}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_7_a6/} }
L. A. Cherkas; L. I. Zhilevich. The limit cycles of certain differential equations. Differencialʹnye uravneniâ, Tome 8 (1972) no. 7, pp. 1207-1213. http://geodesic.mathdoc.fr/item/DE_1972_8_7_a6/