Rezaiki, Nabil, and Amel Boulfoul. “Periodic Solutions of Third Order Differential Equations”. Journal of Innovative Applied Mathematics and Computational Sciences 4, no. 1 (June 18, 2024): 1–10. Accessed December 21, 2024. https://jiamcs.centre-univ-mila.dz/index.php/jiamcs/article/view/v4i1.