Geodesic
On limit and separatrix cycles of a quasiquadratic system
Differencialʹnye uravneniâ, Tome 33 (1997) no. 5, pp. 700-701 
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/
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     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},
     year = {1997},
     volume = {33},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_5_a19/}
}
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