Geodesic
Periodic solutions of first-order differential equations
Differencialʹnye uravneniâ, Tome 19 (1983) no. 11, pp. 1853-1859 
I. V. Kamenev. Periodic solutions of first-order differential equations. Differencialʹnye uravneniâ, Tome 19 (1983) no. 11, pp. 1853-1859. http://geodesic.mathdoc.fr/item/DE_1983_19_11_a2/
@article{DE_1983_19_11_a2,
     author = {I. V. Kamenev},
     title = {Periodic solutions of first-order differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1853--1859},
     year = {1983},
     volume = {19},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_11_a2/}
}
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