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@article{DE_1977_13_3_a2, author = {M. V. Dolov}, title = {Limit cycles and {Darboux} integrals in the case of a node}, journal = {Differencialʹnye uravneni\^a}, pages = {406--415}, publisher = {mathdoc}, volume = {13}, number = {3}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1977_13_3_a2/} }
M. V. Dolov. Limit cycles and Darboux integrals in the case of a node. Differencialʹnye uravneniâ, Tome 13 (1977) no. 3, pp. 406-415. http://geodesic.mathdoc.fr/item/DE_1977_13_3_a2/