@article{COZMA_MATEI_2019, title={CENTER CONDITIONS FOR A CUBIC DIFFERENTIAL SYSTEM WITH TWO INVARIANT STRAIGHT LINES AND ONE INVARIANT ELLIPTIC CURVE }, volume={4}, url={https://revista.ust.md/index.php/acta_exacte/article/view/352}, DOI={10.36120/2587-3644.v4i2.60-69}, abstractNote={<p>For a cubic differential system with a singular point of a center or a focus type having two invariant straight lines one invariant elliptic cubic curve it was proved that a singular point is a center if and only if the first two Lyapunov quantities at this point vanish. There were obtained five sets of conditions for a singular point to be a center</p>}, number={2}, journal={Acta et Commentationes Exact and Natural Sciences}, author={COZMA, Dumitru and MATEI, Angela}, year={2019}, month={Jul.}, pages={60-69} }