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@article{DE_1997_33_5_a19, author = {A. F. Andreev and I. A. Andreeva}, title = {On limit and separatrix cycles of a quasiquadratic system}, journal = {Differencialʹnye uravneni\^a}, pages = {700--701}, publisher = {mathdoc}, volume = {33}, number = {5}, year = {1997}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1997_33_5_a19/} }
A. F. Andreev; I. A. Andreeva. On limit and separatrix cycles of a quasiquadratic system. Differencialʹnye uravneniâ, Tome 33 (1997) no. 5, pp. 700-701. http://geodesic.mathdoc.fr/item/DE_1997_33_5_a19/