Geodesic
A solution of the center and focus problem in a special case
Differencialʹnye uravneniâ, Tome 4 (1968) no. 5, pp. 943-945 Cet article a éte moissonné depuis la source Math-Net.Ru

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@article{DE_1968_4_5_a19,
     author = {A. P. Sadovskii},
     title = {A solution of the center and focus problem in a special case},
     journal = {Differencialʹnye uravneni\^a},
     pages = {943--945},
     year = {1968},
     volume = {4},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_5_a19/}
}
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A. P. Sadovskii. A solution of the center and focus problem in a special case. Differencialʹnye uravneniâ, Tome 4 (1968) no. 5, pp. 943-945. http://geodesic.mathdoc.fr/item/DE_1968_4_5_a19/