Conditions for a center for a certain Li\'enard equation
Differencialʹnye uravneniâ, Tome 12 (1976) no. 2, pp. 292-298.

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@article{DE_1976_12_2_a11,
     author = {L. A. Cherkas},
     title = {Conditions for a center for a certain {Li\'enard} equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {292--298},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1976_12_2_a11/}
}
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L. A. Cherkas. Conditions for a center for a certain Li\'enard equation. Differencialʹnye uravneniâ, Tome 12 (1976) no. 2, pp. 292-298. http://geodesic.mathdoc.fr/item/DE_1976_12_2_a11/