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@article{DE_1974_10_3_a18, author = {I. A. Konovalov}, title = {The limit cycles of a certain dynamical system}, journal = {Differencialʹnye uravneni\^a}, pages = {547--549}, publisher = {mathdoc}, volume = {10}, number = {3}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1974_10_3_a18/} }
I. A. Konovalov. The limit cycles of a certain dynamical system. Differencialʹnye uravneniâ, Tome 10 (1974) no. 3, pp. 547-549. http://geodesic.mathdoc.fr/item/DE_1974_10_3_a18/