Singh, Raghvendra Pratap, and Y. N. Reddy. “A Fitted Second Order Special Finite Difference Method for Singularly Perturbed Differential- Difference Equations Exhibiting Dual Layers”. Journal of Informatics and Mathematical Sciences 12, no. 3 (September 30, 2020): 223–232. Accessed May 2, 2024. http://www.rgnpublications.com/journals/index.php/jims/article/view/1430.