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2. Somerset, J. H. and Evan-Iwanowski, R. M., ?Experiments on large amplitude parametric vibrations of rectangular plates?, Developments in Theoretical and Applied Mechanics, Vol. 3, Proc. Third Southeastern Conference on Theoretical and Applied Mechanics, Columbia, S.C., April 1966, Pergamon Press.
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4. Silver, R. L., ?The effect of initial curvature on the parametric vibration of rectangular plates subjected to an in-plane sinusoidal load?, Ph.D. Diss., Syracuse University, Syracuse, N.Y., January 1972.
5. Kisliakov, S. D., ?Forced and parametrically excited nonlinear vibrations of thin elastic plates with initial imperfections?, Bulgarian Academy, Theoretical and Applied Mechanics, Year VII, No. 4, Sofia, 1976.