Abdul-Hassan Atiyah, Nada, and Marwa Qasaim Atshan. “Theoretical and Numerical Analysis of Singular Perturbation Problems in Ordinary Differential Equations”. Journal of Al-Qadisiyah for Computer Science and Mathematics 16, no. 3 (September 30, 2024): Math. 63–70. Accessed December 3, 2024. https://jqcsm.qu.edu.iq/index.php/journalcm/article/view/1667.