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Doubly asymptotic series for \(n\)-th order differential equations in unbounded domains. (English) Zbl 0289.34081

MSC:
34E15 Singular perturbations, general theory for ordinary differential equations
34M99 Ordinary differential equations in the complex domain
34A25 Analytical theory of ordinary differential equations: series, transformations, transforms, operational calculus, etc.
34A30 Linear ordinary differential equations and systems, general
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