Mindeel M. Al-Abrahemee, K. 2018. Chebyshev Polynomials in Collocation Methods for Solving Singular Perturbation Problems. Al-Qadisiyah Journal of Pure Science. 23, 2 (May 2018), 260 - 268. DOI:https://doi.org/10.29350/jops.2018.23.2.759.