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2. The response of two-degree-of-freedom systems with quadratic non-linearities to a parametric excitation;Nayfeh;Journal of Sound and Vibration,1983
3. Multiple parametric resonance in a nonlinear two-degree-of-freedom system;Tso;International Journal of Nonlinear Mechanics,1974
4. Nonlinear analysis of the lateral response of columns to periodic loads;Tezak;Transactions of the American Society of Mechanical Engineers, Journal of Mechanical Design,1978
5. Parametrically excited non-linear multi-degree-of-freedom systems with repeated natural frequencies;Tezak;Journal of Sound and Vibration,1982