Geodesic
The problem of distinguishing the center and the focus
Differencialʹnye uravneniâ, Tome 9 (1973) no. 4, pp. 650-659 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {A. P. Sadovskii},
     title = {The problem of distinguishing the center and the focus},
     journal = {Differencialʹnye uravneni\^a},
     pages = {650--659},
     year = {1973},
     volume = {9},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1973_9_4_a8/}
}
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A. P. Sadovskii. The problem of distinguishing the center and the focus. Differencialʹnye uravneniâ, Tome 9 (1973) no. 4, pp. 650-659. http://geodesic.mathdoc.fr/item/DE_1973_9_4_a8/