Geodesic
On the question of the construction of periodic solutions of nonautonomous differential equations
Differencialʹnye uravneniâ, Tome 19 (1983) no. 8, pp. 1335-1343 
V. N. Laptinskii. On the question of the construction of periodic solutions of nonautonomous differential equations. Differencialʹnye uravneniâ, Tome 19 (1983) no. 8, pp. 1335-1343. http://geodesic.mathdoc.fr/item/DE_1983_19_8_a5/
@article{DE_1983_19_8_a5,
     author = {V. N. Laptinskii},
     title = {On the question of the construction of periodic solutions of nonautonomous differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1335--1343},
     year = {1983},
     volume = {19},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_8_a5/}
}
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