Geodesic
On the question of separatrices and limit cycles of a certain differential equation
Differencialʹnye uravneniâ, Tome 7 (1971) no. 8, pp. 1525-1527 
L. I. Zhilevich. On the question of separatrices and limit cycles of a certain differential equation. Differencialʹnye uravneniâ, Tome 7 (1971) no. 8, pp. 1525-1527. http://geodesic.mathdoc.fr/item/DE_1971_7_8_a19/
@article{DE_1971_7_8_a19,
     author = {L. I. Zhilevich},
     title = {On the question of separatrices and limit cycles of a certain differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1525--1527},
     year = {1971},
     volume = {7},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_8_a19/}
}
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