Geodesic
On the problem of distinguishing the center and focus for systems of nonlinear oscillations
Differencialʹnye uravneniâ, Tome 12 (1976) no. 12, pp. 2273-2274 Cet article a éte moissonné depuis la source Math-Net.Ru

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@article{DE_1976_12_12_a19,
     author = {A. P. Sadovskii},
     title = {On the problem of distinguishing the center and focus for systems of nonlinear oscillations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2273--2274},
     year = {1976},
     volume = {12},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_12_a19/}
}
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A. P. Sadovskii. On the problem of distinguishing the center and focus for systems of nonlinear oscillations. Differencialʹnye uravneniâ, Tome 12 (1976) no. 12, pp. 2273-2274. http://geodesic.mathdoc.fr/item/DE_1976_12_12_a19/