Geodesic
Solution of the center and focus problem for a cubic system of nonlinear oscillations
Differencialʹnye uravneniâ, Tome 33 (1997) no. 2, pp. 236-244 
A. P. Sadovskii. Solution of the center and focus problem for a cubic system of nonlinear oscillations. Differencialʹnye uravneniâ, Tome 33 (1997) no. 2, pp. 236-244. http://geodesic.mathdoc.fr/item/DE_1997_33_2_a12/
@article{DE_1997_33_2_a12,
     author = {A. P. Sadovskii},
     title = {Solution of the center and focus problem for a cubic system of nonlinear oscillations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {236--244},
     year = {1997},
     volume = {33},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_2_a12/}
}
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