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@article{DE_1979_15_9_a3, author = {V. S. Denisov}, title = {Limit cycles of an autonomous system}, journal = {Differencialʹnye uravneni\^a}, pages = {1572--1579}, publisher = {mathdoc}, volume = {15}, number = {9}, year = {1979}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1979_15_9_a3/} }
V. S. Denisov. Limit cycles of an autonomous system. Differencialʹnye uravneniâ, Tome 15 (1979) no. 9, pp. 1572-1579. http://geodesic.mathdoc.fr/item/DE_1979_15_9_a3/