This paper describes an algorithm for implementing a perturbation method based on an asymptotic expansion of the solution to a second-order differential equation. We also introduce a new symbolic computation system which works with the so-called modified quasipolynomials, as well as an implementation of the algorithm on it.
Juan F. Navarro. "The Asymptotic Expansion Method via Symbolic Computation." J. Appl. Math. 2012 1 - 24, 2012. https://doi.org/10.1155/2012/201340