Geodesic
On limit cycles and separatrices of a quadratic system
Differencialʹnye uravneniâ, Tome 31 (1995) no. 6, pp. 1096-1097 
R. M. Teshev; D. S. Ushkho. On limit cycles and separatrices of a quadratic system. Differencialʹnye uravneniâ, Tome 31 (1995) no. 6, pp. 1096-1097. http://geodesic.mathdoc.fr/item/DE_1995_31_6_a24/
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     author = {R. M. Teshev and D. S. Ushkho},
     title = {On limit cycles and separatrices of a quadratic system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1096--1097},
     year = {1995},
     volume = {31},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1995_31_6_a24/}
}
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