Geodesic
On the question of existence of periodic solutions with an arbitrary period
Differencialʹnye uravneniâ, Tome 2 (1966) no. 3, pp. 422-424 
V. I. Voilokov. On the question of existence of periodic solutions with an arbitrary period. Differencialʹnye uravneniâ, Tome 2 (1966) no. 3, pp. 422-424. http://geodesic.mathdoc.fr/item/DE_1966_2_3_a14/
@article{DE_1966_2_3_a14,
     author = {V. I. Voilokov},
     title = {On the question of existence of periodic solutions with an arbitrary period},
     journal = {Differencialʹnye uravneni\^a},
     pages = {422--424},
     year = {1966},
     volume = {2},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_3_a14/}
}
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