Resonances within chaos.

@article{Gallavotti2011ResonancesWC,
  title={Resonances within chaos.},
  author={Giovanni Gallavotti and Guido Gentile and Alessandro Giuliani},
  journal={Chaos},
  year={2011},
  volume={22 2},
  pages={
          026108
        }
}
A chaotic system under periodic forcing can develop a periodically visited strange attractor. We discuss simple models in which the phenomenon, quite easy to see in numerical simulations, can be completely studied analytically. 

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