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Asymptotic expansions of solutions of the equation \((p(x)y')'-q(x)y=0\) with complex-valued coefficients. (English) Zbl 0271.34066

MSC:

34E05 Asymptotic expansions of solutions to ordinary differential equations
34A30 Linear ordinary differential equations and systems
34D05 Asymptotic properties of solutions to ordinary differential equations
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