Tadi, Mohsen, Miloje Radenkovic, and Yuanlong Wang. “A Numerical Method for the Solution of Singular and Singularly Perturbed Boundary Value Problems”. International Journal of Applied Mathematical Research 3, no. 3 (August 9, 2014): 292–300. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/ijamr/article/view/3122.