1. Nayfeh, A. H., ?Application of the method of multiple scales to nonlinearly coupled oscillators?, in Lasers, Molecules and Methods, edited by J. O.Hirschfelder, R. E.Wyatt, and R. D.Coalson, John Wiley & Sons, New York, 1989, pp. 137?196.
2. Nayfeh, A. H. and Balachandran, B., ?Modal interactions in dynamical and structural systems?, Applied Mechanics Reviews 42, 1989, 175?201.
3. Nayfeh, A. H. and Mook, D. T., Nonlinear Oscillations, Wiley-Interscience, New York, 1979.
4. Froude, W., ?Remarks on Mr. Scott-Russell's paper on rolling?, Transactions of the Institute of Naval Architects 4, 1863, 232?275.
5. Nayfeh, A. H. and Mook, D. T., ?A saturation phenomenon in the forced response of systems with quadratic nonlinearities?, Proceedings of the 8th International Conference on Nonlinear Oscillations, September 11?15, 1978, Prague, Czechoslovakia, pp. 511?516.