1. Zhou ZY, Shen JH (2011) Delayed phenomenon of loss of stability of solutions in a second-order quasi-linear singularly perturbed boundary value problem with a turning point. Bound Value Probl 1:1–13
2. Chen SL (2004) The asymptotic solutions for a class of singularly perturbed nonlinear equations. Pure Appl Math 20(4):344–349
3. Vasil’eva AB, Butuzov Writing VF, Ni MK, Translation LWZ (2008) Asymptotic expansions of singularly perturbed differential equations. Higher Education Press, Beijing (in chinese)
4. Jiang FR (1981) On the boundary layer methods. Appl Math Mech 2(5):505–518
5. Mo JQ, Chen SL (2000) The singularly perturbed nonlinear boundary value problem. J Math Res Expos 20(1):57–61