Geodesic
The problem of center and focus
Differencialʹnye uravneniâ, Tome 4 (1968) no. 11, pp. 2002-2009 Cet article a éte moissonné depuis la source Math-Net.Ru

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@article{DE_1968_4_11_a8,
     author = {A. P. Sadovskii},
     title = {The problem of center and focus},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2002--2009},
     year = {1968},
     volume = {4},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_11_a8/}
}
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A. P. Sadovskii. The problem of center and focus. Differencialʹnye uravneniâ, Tome 4 (1968) no. 11, pp. 2002-2009. http://geodesic.mathdoc.fr/item/DE_1968_4_11_a8/