1. Zienkiewicz, O. C. and Cheung, Y. K., The Finite Element Method in Structural and Continuum Mechanics, McGraw-Hill Book Company, Inc., New York (1967).
2. Zienkiewicz, O. C., Applied Mechanics Review, 23, 3, p. 249 (1970).
3. DeArantes e Oliveira, E. R., International Journal of Solids and Structures, 4, 10, p. 929 (1968).
4. Pian, T. H. H. and Ping Tong, International Journal of Solids and Structures, 3, 5, p. 865 (1967).
5. Chan, S. K., Tuba, I. S. and Wilson, W. K., Engineering Fracture Mechanics, 2, 1, p. 1 (1970).