Geodesic
Integrability conditions for a~class of cubic differential systems with a~bundle of two invariant straight lines and one invariant cubic
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2018), pp. 120-138.

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We determine conditions for the origin to be a center for a class of cubic differential systems having a bundle of two invariant straight lines and one invariant cubic. We prove that a fine focus O(0,0) is a center if and only if the first three Lyapunov quantities vanish. 
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Dimitru Cozma; Anatoli Dascalescu. Integrability conditions for a~class of cubic differential systems with a~bundle of two invariant straight lines and one invariant cubic. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2018), pp. 120-138. https://geodesic-test.mathdoc.fr/item/BASM_2018_1_a8/

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