Zainab AYATI และ Jafar BIAZAR. (2014) Modification of the Homotopy Perturbation Method and It's Convergence. <i>Walailak Journal of Science and Technology</i>, <i>11</i>(7), 633-642.Zainab AYATI และ Jafar BIAZAR. "Modification of the Homotopy Perturbation Method and It's Convergence". Walailak Journal of Science and Technology 11 (2014):633-642.Zainab AYATI และ Jafar BIAZAR. Modification of the Homotopy Perturbation Method and It's Convergence. Walailak University:ม.ป.ท. 2014.