Geodesic
Tests for the existence of the center, and its isochronism
Differencialʹnye uravneniâ, Tome 10 (1974) no. 4, pp. 585-590.

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     author = {V. V. Amel'kin and N. A. Lukashevich},
     title = {Tests for the existence of the center, and its isochronism},
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V. V. Amel'kin; N. A. Lukashevich. Tests for the existence of the center, and its isochronism. Differencialʹnye uravneniâ, Tome 10 (1974) no. 4, pp. 585-590. http://geodesic.mathdoc.fr/item/DE_1974_10_4_a1/