Shwayyea, Rana T. “An Efficient Parallel Algorithm for the Numerical Solution for Singularly Perturbed Delay Differential Equations With Layer Behavior”. Journal of Al-Qadisiyah for Computer Science and Mathematics, vol. 12, no. 2, July 2020, pp. Math Page 97– 106, doi:10.29304/jqcm.2020.12.2.700.