علي كنان, and سليمان محمود. “The Combined Sumudu Transform and New Homotopy Perturbation Methods for Stiff Systems of Differential Equations”. Tishreen University Journal -Basic Sciences Series 44, no. 3 (September 4, 2022): 167–182. Accessed November 29, 2024. https://journal.tishreen.edu.sy/index.php/bassnc/article/view/11739.