On the question of approximate determination of periodic solutions of differential equations
Differencialʹnye uravneniâ, Tome 19 (1983) no. 11, pp. 2001-2004.

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     author = {O. I. Nikitin and A. I. Perov},
     title = {On the question of approximate determination of periodic solutions of differential equations},
     journal = {Differencialʹnye uravneni\^a},
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     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1983_19_11_a27/}
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O. I. Nikitin; A. I. Perov. On the question of approximate determination of periodic solutions of differential equations. Differencialʹnye uravneniâ, Tome 19 (1983) no. 11, pp. 2001-2004. http://geodesic.mathdoc.fr/item/DE_1983_19_11_a27/