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[2] B. Irons, Techniques of Finite Elements, Chicester, England: E. Horwood, 1980.

[3] O. C. Zienkiewicz, The Finite Element Method, 4th ed, London: McGraw-Hill, 1991.

[4] R. Maeder, The Mathematica Programmer, Cambridge: AP Professional, 1994.

[5] A. Goldberg, Smalltalk-80, 2nd ed., Addison-Wesley, 1989.