Large scale oscillatory behaviour in loaded asymmetric systems A. C. Lazer, P. J. McKenna (1987) Annales de l'I.H.P. Analyse non linéaire
Limiting phase trajectories and resonance energy transfer in a system of two coupled oscillators. Manevitch, L.I., Kovaleva, A.S., Manevitch, E.L. (2010) Mathematical Problems in Engineering
Linear fractionally damped oscillator. Naber, Mark (2010) International Journal of Differential Equations