Geodesic
The absence of limit cycles of a certain differential equation
Differencialʹnye uravneniâ, Tome 8 (1972) no. 12, pp. 2271-2273 
L. A. Cherkas; L. I. Zhilevich. The absence of limit cycles of a certain differential equation. Differencialʹnye uravneniâ, Tome 8 (1972) no. 12, pp. 2271-2273. http://geodesic.mathdoc.fr/item/DE_1972_8_12_a26/
@article{DE_1972_8_12_a26,
     author = {L. A. Cherkas and L. I. Zhilevich},
     title = {The absence of limit cycles of a certain differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2271--2273},
     year = {1972},
     volume = {8},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_12_a26/}
}
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