Problem of the center and the integrating factor for a Li\'enard equation
Differencialʹnye uravneniâ, Tome 17 (1981) no. 5, pp. 936-940.

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@article{DE_1981_17_5_a23,
     author = {A. A. Samodurov},
     title = {Problem of the center and the integrating factor for a {Li\'enard} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {936--940},
     publisher = {mathdoc},
     volume = {17},
     number = {5},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_5_a23/}
}
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A. A. Samodurov. Problem of the center and the integrating factor for a Li\'enard equation. Differencialʹnye uravneniâ, Tome 17 (1981) no. 5, pp. 936-940. http://geodesic.mathdoc.fr/item/DE_1981_17_5_a23/