1. Fitted Numerical Methods for Singular Perturbation Problems. World Scientific, Singapore 1995.
2. Numerical Solution of Convection-Diffusion Problems. Chapman & Hall: London, 1996.
3. Numerical Methods for Singularly Perturbed Differential Equations. Springer: Berlin, 1996.
4. Superconvergent approximation of singularly perturbed problems. Report No. 97-ZZ2, Department of Mathematics and Statistics, Texas Tech University, October 1997.