Geodesic
The existence of a family of periodic solutions of a system of two second order differential equations
Differencialʹnye uravneniâ, Tome 5 (1969) no. 5, pp. 814-823.

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     author = {I. A. Pasynkova},
     title = {The existence of a family of periodic solutions of a system of two second order differential equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {814--823},
     publisher = {mathdoc},
     volume = {5},
     number = {5},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_5_a2/}
}
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I. A. Pasynkova. The existence of a family of periodic solutions of a system of two second order differential equations. Differencialʹnye uravneniâ, Tome 5 (1969) no. 5, pp. 814-823. http://geodesic.mathdoc.fr/item/DE_1969_5_5_a2/