
doi: 10.1007/bf01093150
Translation from Ukr. Mat. Zh. 34, No.5, 655-656 (Russian) (1982; Zbl 0512.70027).
Averaging method for ordinary differential equations, Perturbations, asymptotics of solutions to ordinary differential equations, van der Pol equation, Linear ordinary differential equations and systems, periodic or conditionally periodic, Nonlinear resonances for nonlinear problems in mechanics
Averaging method for ordinary differential equations, Perturbations, asymptotics of solutions to ordinary differential equations, van der Pol equation, Linear ordinary differential equations and systems, periodic or conditionally periodic, Nonlinear resonances for nonlinear problems in mechanics
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