Szukana fraza: [Abstract = "A generalized eigenvalue problem is obtained and solved numerically for a frequency parameter and an associated eigenvector of spline coefficients. Two layered shells with three different types of materials under clamped\-clamped boundary conditions are considered. Parametric studies are made on the variation of the frequency parameter with respect to length\-to\-radius ratio and length\-to\-thickness ratio."]

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