Geodesic
On the finiteness of the number of limit cycles in a quadratic system
Differencialʹnye uravneniâ, Tome 24 (1988) no. 11, pp. 1904-1911 
V. G. Romanovsky. On the finiteness of the number of limit cycles in a quadratic system. Differencialʹnye uravneniâ, Tome 24 (1988) no. 11, pp. 1904-1911. http://geodesic.mathdoc.fr/item/DE_1988_24_11_a7/
@article{DE_1988_24_11_a7,
     author = {V. G. Romanovsky},
     title = {On the finiteness of the number of limit cycles in a quadratic system},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1904--1911},
     year = {1988},
     volume = {24},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_11_a7/}
}
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