Moussa, B., Youssouf, M., Abdoul Wassiha, N., & Youssouf, P. (2024). HOMOTOPY PERTURBATION METHOD TO SOLVE DUFFING-VAN DER POL EQUATION. Advances in Differential Equations and Control Processes, 31(3), 299-315. https://doi.org/10.17654/0974324324016