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Asymptotic conditions for periodic solutions of ordinary differential equations. (English) Zbl 0461.34029

##### MSC:
 34C25 Periodic solutions to ordinary differential equations 34C15 Nonlinear oscillations and coupled oscillators for ordinary differential equations 34E05 Asymptotic expansions of solutions to ordinary differential equations 34A34 Nonlinear ordinary differential equations and systems
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##### References:
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