Phaneendra, K., and M. Lalu. “Gaussian Quadrature for Two-Point Singularly Perturbed Boundary Value Problems With Exponential Fitting”. Communications in Mathematics and Applications 10, no. 3 (September 30, 2019): 447–467. Accessed July 3, 2024. https://rgnpublications.com/journals/index.php/cma/article/view/1100.