Dynamic Analysis and Accurate Analytical Solution of the Hybrid Duffing-Van der pol Oscillator via a Modified Homotopy Perturbation Method . JUBPAS [Internet]. 2026 Jun. 30 [cited 2026 Jun. 30];34(2):189-211. Available from: https://www.journalofbabylon.com/index.php/JUBPAS/article/view/6612