Vidyasagar, V., and M. Sridevi. “Numerical Solutions For Singularly Perturbed Differential-Difference Equations: A Dual-Layer Fitted Approach”. Migration Letters 21, no. S7 (March 4, 2024): 735–743. Accessed November 24, 2024. https://migrationletters.com/index.php/ml/article/view/8804.