1. Matched Asymptotic Expansions and Singular Perturbations;Eckhaus,1973
2. Matched Asymptotic Expansions. Ideas and Techniques;Lagerstrom,1988
3. Singular Perturbation Methods for Ordinary Differential Equations;O’Malley (Jr.),1991
4. Multiple Scale and Singular Perturbation Methods;Kevorkian,1996
5. Perturbation Methods;Nayfeh,2000