Geodesic
Conditions for the occurrence of the problem of center and focus
Differencialʹnye uravneniâ, Tome 13 (1977) no. 6, pp. 1061-1069.

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     author = {A. V. Skitovich},
     title = {Conditions for the occurrence of the problem of center and focus},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1061--1069},
     publisher = {mathdoc},
     volume = {13},
     number = {6},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1977_13_6_a10/}
}
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A. V. Skitovich. Conditions for the occurrence of the problem of center and focus. Differencialʹnye uravneniâ, Tome 13 (1977) no. 6, pp. 1061-1069. http://geodesic.mathdoc.fr/item/DE_1977_13_6_a10/