Geodesic
A second-degree polynomial Dulac function for a cubic system on the plane
Differencialʹnye uravneniâ, Tome 33 (1997) no. 10, pp. 1435-1436.

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     author = {L. A. Cherkas and A. A. Grin'},
     title = {A second-degree polynomial {Dulac} function for a cubic system on the plane},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1435--1436},
     publisher = {mathdoc},
     volume = {33},
     number = {10},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1997_33_10_a19/}
}
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L. A. Cherkas; A. A. Grin'. A second-degree polynomial Dulac function for a cubic system on the plane. Differencialʹnye uravneniâ, Tome 33 (1997) no. 10, pp. 1435-1436. http://geodesic.mathdoc.fr/item/DE_1997_33_10_a19/