علي ك. . and سليمان محمود (2022) “The Combined Sumudu Transform and New Homotopy Perturbation Methods for Stiff Systems of Differential Equations”, Tishreen University Journal -Basic Sciences Series, 44(3), pp. 167–182. Available at: https://journal.tishreen.edu.sy/index.php/bassnc/article/view/11739 (Accessed: 29November2024).