Geodesic
On the problem of discrimination of center and focus
Differencialʹnye uravneniâ, Tome 5 (1969) no. 2, pp. 326-330 
A. P. Sadovskii. On the problem of discrimination of center and focus. Differencialʹnye uravneniâ, Tome 5 (1969) no. 2, pp. 326-330. http://geodesic.mathdoc.fr/item/DE_1969_5_2_a10/
@article{DE_1969_5_2_a10,
     author = {A. P. Sadovskii},
     title = {On the problem of discrimination of center and focus},
     journal = {Differencialʹnye uravneni\^a},
     pages = {326--330},
     year = {1969},
     volume = {5},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1969_5_2_a10/}
}
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