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2. K. J. Bathe, Finite Element Procedures in Engineering Analysis. Prentice-Hall, Englewood Cliffs, NJ.
3. R. D. Cook, D. S. Malkus and M. E. Plesha, Concepts and Applications of Finite Element Analysis, 3rd edn. John Wiley, New York.
4. Discrete approximations related to nonlinear theories of solids;Wempner;Int. J. Solids Structures,1971
5. An incremental approach to the solution of snapping and buckling problems;Riks;Int. J. Solids Structures,1979