## 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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