A. J. Khaleel, “The Homotopy Perturbation Method for Solving Some Types of Nonlocal Problems with Some Real Life Applications”, Al-Nahrain J. Sci., vol. 15, no. 3, pp. 179–189, Sep. 2012, Accessed: May 22, 2026. [Online]. Available: https://mail.anjs.edu.iq/index.php/anjs/article/view/845