Donato, Andrea and Palumbo, Annunziata (2000) Approximate Asymptotic Symmetries. Memorie scientifiche di Andrea Donato, LXXVII. pp. 437-447.
We modify the procedure of determining approximate one parameter group of transformations by introducing an asymptotic development which makes possible the matching between dissipative or dispersive effects and non-linearity. Once that the generators of the approximate group are determined approximate asymptotic invariant solutions can be determined
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