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Regular version of the site

## Resonant forced oscillations in systems with periodic nonlinearities

Discrete and Continuous Dynamical Systems. 2013. Vol. 33. No. 1. P. 239-254.

We present an approach to study degenerate ODE with periodic nonlinearities; for resonant higher order nonlinear equations L(p)x=f(x)+b(t), p=d/dt, with 2pi-periodic forcing b and periodic f we give multiplicity results, in particular, conditions of existence of infinite and unbounded sets of 2pi-periodic solutions.