Letter to the editors ("The existence of families of periodic solutions of a system of $n$ second order differential equations in the resonance case'', Differencial'nye Uravnenija \textbf{5} (1969), 1984--1989)
Differencialʹnye uravneniâ, Tome 9 (1973) no. 1.

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     author = {I. A. Pasynkova},
     title = {Letter to the editors {("The} existence of families of periodic solutions of a system of $n$ second order differential equations in the resonance case'', {Differencial'nye} {Uravnenija} \textbf{5} (1969), 1984--1989)},
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I. A. Pasynkova. Letter to the editors ("The existence of families of periodic solutions of a system of $n$ second order differential equations in the resonance case'', Differencial'nye Uravnenija \textbf{5} (1969), 1984--1989). Differencialʹnye uravneniâ, Tome 9 (1973) no. 1. http://geodesic.mathdoc.fr/item/DE_1973_9_1_a29/