Geodesic
A Dulac function in a half-plane in the form of a polynomial of the second degree for a quadratic system
Differencialʹnye uravneniâ, Tome 34 (1998) no. 10, pp. 1346-1348.

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     author = {L. A. Cherkas and A. A. Grin'},
     title = {A {Dulac} function in a half-plane in the form of a polynomial of the second degree for a quadratic system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1346--1348},
     publisher = {mathdoc},
     volume = {34},
     number = {10},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1998_34_10_a7/}
}
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L. A. Cherkas; A. A. Grin'. A Dulac function in a half-plane in the form of a polynomial of the second degree for a quadratic system. Differencialʹnye uravneniâ, Tome 34 (1998) no. 10, pp. 1346-1348. http://geodesic.mathdoc.fr/item/DE_1998_34_10_a7/