A quadratic system with a limit cycle surrounded by a separatrix loop of a saddle
Differencialʹnye uravneniâ, Tome 28 (1992) no. 9, pp. 1643-1644.

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     author = {V. V. Stolyarov},
     title = {A quadratic system with a limit cycle surrounded by a separatrix loop of a saddle},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1643--1644},
     publisher = {mathdoc},
     volume = {28},
     number = {9},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_9_a25/}
}
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V. V. Stolyarov. A quadratic system with a limit cycle surrounded by a separatrix loop of a saddle. Differencialʹnye uravneniâ, Tome 28 (1992) no. 9, pp. 1643-1644. http://geodesic.mathdoc.fr/item/DE_1992_28_9_a25/