Geodesic
A solution for the problem of center and focus for certain systems of non-linear oscillations
Differencialʹnye uravneniâ, Tome 14 (1978) no. 2, pp. 380-382 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {A. P. Sadovskii},
     title = {A solution for the problem of center and focus for certain systems of non-linear oscillations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {380--382},
     year = {1978},
     volume = {14},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_2_a25/}
}
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A. P. Sadovskii. A solution for the problem of center and focus for certain systems of non-linear oscillations. Differencialʹnye uravneniâ, Tome 14 (1978) no. 2, pp. 380-382. http://geodesic.mathdoc.fr/item/DE_1978_14_2_a25/