Geodesic
The cycles of a certain first order equation
Differencialʹnye uravneniâ, Tome 5 (1969) no. 7, pp. 1159-1166 
A. P. Vorob'ev. The cycles of a certain first order equation. Differencialʹnye uravneniâ, Tome 5 (1969) no. 7, pp. 1159-1166. http://geodesic.mathdoc.fr/item/DE_1969_5_7_a0/
@article{DE_1969_5_7_a0,
     author = {A. P. Vorob'ev},
     title = {The cycles of a certain first order equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1159--1166},
     year = {1969},
     volume = {5},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_7_a0/}
}
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