Geodesic
A problem of distinguishing the center and focus for a case of a complex singular point
Differencialʹnye uravneniâ, Tome 22 (1986) no. 5, pp. 789-794.

Voir la notice de l'article provenant de la source Math-Net.Ru

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     author = {A. P. Sadovskii},
     title = {A problem of distinguishing the center and focus for a case of a complex singular point},
     journal = {Differencialʹnye uravneni\^a},
     pages = {789--794},
     publisher = {mathdoc},
     volume = {22},
     number = {5},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_5_a7/}
}
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A. P. Sadovskii. A problem of distinguishing the center and focus for a case of a complex singular point. Differencialʹnye uravneniâ, Tome 22 (1986) no. 5, pp. 789-794. http://geodesic.mathdoc.fr/item/DE_1986_22_5_a7/