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2. Bhat R. B. “Vibration of Structures Using Characteristic Orthogonal Polynomials in Rayleigh‐Ritz Method ” 10th Canadian Congress of Applied Mechanics London Ontario Canada June 2–7 1985.
3. Chihara T. S. “Introduction to Orthogonal Polynomials ” Gordon and Breach Science Publishers London England 1978.
4. The free vibration of rectangular plates