Conditions for a center in the case of homogeneous nonlinearities of third degree
Differencialʹnye uravneniâ, Tome 1 (1965) no. 11, pp. 1482-1487.

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     author = {V. A. Lunkevich and K. S. Sibirskii},
     title = {Conditions for a center in the case of homogeneous nonlinearities of third degree},
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V. A. Lunkevich; K. S. Sibirskii. Conditions for a center in the case of homogeneous nonlinearities of third degree. Differencialʹnye uravneniâ, Tome 1 (1965) no. 11, pp. 1482-1487. http://geodesic.mathdoc.fr/item/DE_1965_1_11_a4/