1. Nonlinear Oscillations;Nayfeh,1979
2. Nonlinear detuning of resonant structural vibrations;Mojaddidy,1979
3. Quenching of primary resonance by a superharmonic resonance;Nayfeh;Journal of Sound and Vibration,1984
4. Introduction to Perturbation Techniques;Nayfeh,1981
5. Perturbation Methods;Nayfeh,1973