Geodesic
Centers and Foci for a Class of Cubic Systems
Differencialʹnye uravneniâ, Tome 36 (2000) no. 12, pp. 1652-1657 
A. P. Sadovskii. Centers and Foci for a Class of Cubic Systems. Differencialʹnye uravneniâ, Tome 36 (2000) no. 12, pp. 1652-1657. http://geodesic.mathdoc.fr/item/DE_2000_36_12_a8/
@article{DE_2000_36_12_a8,
     author = {A. P. Sadovskii},
     title = {Centers and {Foci} for a {Class} of {Cubic} {Systems}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1652--1657},
     year = {2000},
     volume = {36},
     number = {12},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2000_36_12_a8/}
}
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