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2. Structural analysis by the displacement method;Taig,1961
3. The Finite Element Method in Engineering Sciences;Zienkiewicz,1971
4. B. M. Irons, Shape functions for Elements with Point Conformity, A.S.M. 1204, Rolls-Royce Library.
5. The Mathematical Foundations of the Finite Element Method with Applications to Partial Differential Equations;Irons,1979