Geodesic
Conditions for two centers for a quadratic differential system
Differencialʹnye uravneniâ, Tome 14 (1978) no. 9, pp. 1589-1593 Cet article a éte moissonné depuis la source Math-Net.Ru

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     author = {\`E. F. Kirnitskaya and K. S. Sibirskii},
     title = {Conditions for two centers for a quadratic differential system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1589--1593},
     year = {1978},
     volume = {14},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_9_a5/}
}
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È. F. Kirnitskaya; K. S. Sibirskii. Conditions for two centers for a quadratic differential system. Differencialʹnye uravneniâ, Tome 14 (1978) no. 9, pp. 1589-1593. http://geodesic.mathdoc.fr/item/DE_1978_14_9_a5/