1. E.J. Hinch, Perturbation Methods (Cambridge University Press, 1991), Chs. 1-3, 5-7.
  2. C.M. Bender and S.A. Orszag, Advanced Mathematical Methods for Scientists and Engineers (Springer, 1999), Chs. 6, 7, 9-11.
  3. J. Kevorkian and J.D. Cole, Perturbation Methods in Applied Mathematics (Springer-Verlag, 1981), Chs. 1, 2.1-2.5, 3.1, 3.2, 3.6, 4.1, 5.2.
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