Geodesic
Solution of the problem of the center and focus for a Li\'enard system with polynomial coefficients
Differencialʹnye uravneniâ, Tome 11 (1975) no. 11, pp. 2102-2104.

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@article{DE_1975_11_11_a23,
     author = {A. P. Sadovskii},
     title = {Solution of the problem of the center and focus for a {Li\'enard} system with polynomial coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2102--2104},
     publisher = {mathdoc},
     volume = {11},
     number = {11},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_11_a23/}
}
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A. P. Sadovskii. Solution of the problem of the center and focus for a Li\'enard system with polynomial coefficients. Differencialʹnye uravneniâ, Tome 11 (1975) no. 11, pp. 2102-2104. http://geodesic.mathdoc.fr/item/DE_1975_11_11_a23/