Geodesic
Conditions for the problem of the center and focus to arise for an $A_3$-system
Differencialʹnye uravneniâ, Tome 26 (1990) no. 10, pp. 1743-1753.

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     author = {A. P. Sadovskii},
     title = {Conditions for the problem of the center and focus to arise for an $A_3$-system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1743--1753},
     publisher = {mathdoc},
     volume = {26},
     number = {10},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1990_26_10_a11/}
}
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A. P. Sadovskii. Conditions for the problem of the center and focus to arise for an $A_3$-system. Differencialʹnye uravneniâ, Tome 26 (1990) no. 10, pp. 1743-1753. http://geodesic.mathdoc.fr/item/DE_1990_26_10_a11/