1. Introduction to Perturbation Techniques;Nayfeh,1993
2. Singular Perturbation Methods for Ordinary Differential Equations;O’Malley,1991
3. Layer-Adapted Meshes for Reaction–Convection–Diffusion Problems;Linss,2010
4. Robust Numerical Methods for Singularly Perturbed Differential Equations;Roos,2008
5. The SDFEM for a convection–diffusion problem with two small parameters;Roos;Comput. Methods Appl. Math.,2003