with the method of non-linearity scale, the singular perturbation solution for a class of two order different equations is discussed, involving small parameter in the two order derivative.
利用非线性尺度法讨论了在高阶导数含有小参数的一类二阶微分方程的奇异摄动解。
the singular perturbation solution for a class differential equations with turning points is discussed by the transformation of goldstein.