BENDJEDDOU , Ahmed, and Rachid BOUKOUCHA. “Explicit Limit Cycles of a Cubic Polynomial Differential Systems”. Studia Universitatis Babeș-Bolyai Mathematica 61, no. 1 (March 30, 2016): 77–85. Accessed January 19, 2026. https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5518.