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[7]    P. A. Farrell, A. F. Hegarty, J. J. H. Miller, E. O’Riordan and G. I. Shishkin, Robust Computational Techniques for Boundary Layers, Chapman-Hall/CRC, New York, 2000.

[8]    R. E. O’Malley, Singular Perturbations Methods for Ordinary Differential Equations, Springer-Verlag, New York, 1991.

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[11]    Zhongdi Cen, Aimin Xu and Anbo Le, A second-order hybrid finite difference scheme for a system of singularly perturbed initial value problems, J. Comput. Appl. Math. 234 (2010), 3445-3457.