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3. Shan Lu: The programming of the finite element method in analysis of heat structural (Northwestern Polytechnical University Press, 2003(in chinese).
4. Arthur P. Boresi Ken P. Chong Sunil Saigal: Approximate Solution Methods in Engineering Mechanics(Second Edition., John Wiley & Sons, INC., 2003).
5. C. Meyer: J. Structural Division, ASCE. Vol. 99 (1973), p.1507.