Geodesic
Conditions for a center for equations $y'=(Q_1+Q_n)/(P_1+P_n)$
Differencialʹnye uravneniâ, Tome 11 (1975) no. 12, pp. 2177-2182.

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@article{DE_1975_11_12_a6,
     author = {L. A. Cherkas},
     title = {Conditions for a center for equations $y'=(Q_1+Q_n)/(P_1+P_n)$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2177--2182},
     publisher = {mathdoc},
     volume = {11},
     number = {12},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_12_a6/}
}
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L. A. Cherkas. Conditions for a center for equations $y'=(Q_1+Q_n)/(P_1+P_n)$. Differencialʹnye uravneniâ, Tome 11 (1975) no. 12, pp. 2177-2182. http://geodesic.mathdoc.fr/item/DE_1975_11_12_a6/