1. K.J. Bathe, Finite Element Procedures in Engineering Analysis, Prentice-Hall, New Jersey (1982).
2. S.L. Crouch and A.M. Starfield, Boundary Element Method in Solid Mechanics, G. Allen & Unwin Publ. Ltd. (1983).
3. J.H. Curran and L. Vadamme, ?Determination of the two-dimensional distribution of stress around a crack?, University of Toronto Publication 83-10 (1983).
4. C.A. Brebbia, J.C.F. Telles and L.C. Wrobel, Boundary Element Techniques, Springer-Verlag, NY (1984).
5. A.R. Ingraffea, Rock Fracture Mechanics, Springer-Verlag, NY (1983).