Geodesic
Solution of the center problem for cubic systems with a~bundle of three invariant straight lines
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2003), pp. 91-101.

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For cubic differential system with three invariant straight lines which pass through the same point it is proved that a singular point with purely imaginary eigenvalues (weak focus) is a center if and only if the focal values g2j+1, j=1,5―, vanish. 
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Alexandru Şubă. Solution of the center problem  for cubic systems with a~bundle of three invariant  straight lines. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2003), pp. 91-101. https://geodesic-test.mathdoc.fr/item/BASM_2003_1_a9/

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