Kritische Frequenzen von Systemen, die in bezug auf die Zeitumkehr invariant sind.(Russian)Zbl 0284.34048

MSC:

 34C25 Periodic solutions to ordinary differential equations 34D05 Asymptotic properties of solutions to ordinary differential equations 34A25 Analytical theory of ordinary differential equations: series, transformations, transforms, operational calculus, etc. 34A30 Linear ordinary differential equations and systems