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Publication:3857107
zbMATH Open0423.34057MaRDI QIDQ3857107
Publication date: 1977
Title of this publication is not available (Why is that?)
Periodic solutions to ordinary differential equations (34C25) Nonlinear ordinary differential equations and systems (34A34) Averaging method for ordinary differential equations (34C29) Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations (34C10)
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