Geodesic
Solution of the center-focus problem for a cubic system reducible to a lienard system
Differencialʹnye uravneniâ, Tome 42 (2006) no. 1, pp. 11-22 
Yu. L. Bondar; A. P. Sadovskii. Solution of the center-focus problem for a cubic system reducible to a lienard system. Differencialʹnye uravneniâ, Tome 42 (2006) no. 1, pp. 11-22. http://geodesic.mathdoc.fr/item/DE_2006_42_1_a1/
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     title = {Solution of the center-focus problem for a cubic system reducible to a lienard system},
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     year = {2006},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_1_a1/}
}
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