On conditions for a center
Differencialʹnye uravneniâ, Tome 1 (1965) no. 2, pp. 176-181.

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     title = {On conditions for a center},
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V. A. Lunkevich; K. S. Sibirskii. On conditions for a center. Differencialʹnye uravneniâ, Tome 1 (1965) no. 2, pp. 176-181. http://geodesic.mathdoc.fr/item/DE_1965_1_2_a4/