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@article{DE_1968_4_5_a4, author = {M. V. Dolov}, title = {A certain method of investigation of limit cycles}, journal = {Differencialʹnye uravneni\^a}, pages = {812--820}, publisher = {mathdoc}, volume = {4}, number = {5}, year = {1968}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1968_4_5_a4/} }
M. V. Dolov. A certain method of investigation of limit cycles. Differencialʹnye uravneniâ, Tome 4 (1968) no. 5, pp. 812-820. http://geodesic.mathdoc.fr/item/DE_1968_4_5_a4/