The existence of families of periodic solutions of a system of $n$ second order differential equations in the resonance case
Differencialʹnye uravneniâ, Tome 5 (1969) no. 11, pp. 1984-1989.

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     author = {I. A. Pasynkova},
     title = {The existence of families of periodic solutions of a system of $n$ second order differential equations in the resonance case},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1984--1989},
     publisher = {mathdoc},
     volume = {5},
     number = {11},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_11_a3/}
}
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I. A. Pasynkova. The existence of families of periodic solutions of a system of $n$ second order differential equations in the resonance case. Differencialʹnye uravneniâ, Tome 5 (1969) no. 11, pp. 1984-1989. http://geodesic.mathdoc.fr/item/DE_1969_5_11_a3/