With the rapid development of science and technology especially in the last 3 decades there has been a serious challenge to scientists and engineers to search for new theory and methods for solving nonlinear mathematical problems. As a result, a lot of new methods for nonlinear analysis have been suggested, e.g. Refs. [1,3,6-10]. Among them, the most well-developed and widely used one is obviously the perturbation method, especially the singular perturbation theory.
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