Geodesic
On the number of limit cycles in the neighborhood of a singular point
Differencialʹnye uravneniâ, Tome 1 (1965) no. 1, pp. 53-66.

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     author = {K. S. Sibirskii},
     title = {On the number of limit cycles in the neighborhood of a singular point},
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     year = {1965},
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     url = {http://geodesic.mathdoc.fr/item/DE_1965_1_1_a6/}
}
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K. S. Sibirskii. On the number of limit cycles in the neighborhood of a singular point. Differencialʹnye uravneniâ, Tome 1 (1965) no. 1, pp. 53-66. http://geodesic.mathdoc.fr/item/DE_1965_1_1_a6/