Geodesic
The isochronism of a center of certain systems of differential equations
Differencialʹnye uravneniâ, Tome 1 (1965) no. 3, pp. 295-302.

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     author = {N. A. Lukashevich},
     title = {The isochronism of a center of certain systems of differential equations},
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N. A. Lukashevich. The isochronism of a center of certain systems of differential equations. Differencialʹnye uravneniâ, Tome 1 (1965) no. 3, pp. 295-302. http://geodesic.mathdoc.fr/item/DE_1965_1_3_a1/