1. Singular perturbations for difference equations;Comstock;Rocky Mountain J. Math.,1976
2. On the convergence of iterative methods for linear systems arising from singularly perturbed equations;Farrell,1998
3. Optimal Control of Singularly Perturbed Linear Systems and Applications: High-Accuracy Techniques;Gajic,2001
4. Solving Ordinary Differential Equations II, Stiff and Differential-Algebraic Problems;Haier,1991
5. Introduction to Perturbation Methods;Holmes,1998