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@article{DE_1992_28_8_a24, author = {Yu. V. Malyshev and V. P. Zakharov}, title = {Quadratic systems with limit cycles}, journal = {Differencialʹnye uravneni\^a}, pages = {1459--1461}, publisher = {mathdoc}, volume = {28}, number = {8}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1992_28_8_a24/} }
Yu. V. Malyshev; V. P. Zakharov. Quadratic systems with limit cycles. Differencialʹnye uravneniâ, Tome 28 (1992) no. 8, pp. 1459-1461. http://geodesic.mathdoc.fr/item/DE_1992_28_8_a24/