Geodesic
Examples of the generation of a limit cycle from a separatrix loop and a singular cycle
Differencialʹnye uravneniâ, Tome 5 (1969) no. 7, pp. 1335-1337 
N. I. Avdonin. Examples of the generation of a limit cycle from a separatrix loop and a singular cycle. Differencialʹnye uravneniâ, Tome 5 (1969) no. 7, pp. 1335-1337. http://geodesic.mathdoc.fr/item/DE_1969_5_7_a21/
@article{DE_1969_5_7_a21,
     author = {N. I. Avdonin},
     title = {Examples of the generation of a limit cycle from a separatrix loop and a singular cycle},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1335--1337},
     year = {1969},
     volume = {5},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_7_a21/}
}
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