1. Kassir, M. K. and Sih, G. C., Three dimensional crack problems, Noordhoff International Publishing Leyden 1975.
2. Kassir, M. K., Boussinesq problems for a nonhomogeneous solid, Proc. ASCE, Jour. Engng. Mech. Div., 98 (1972) 457?470.
3. Kassir, M. K. and Chuaprascrt, M. F., A rigid punch in contact with a nonhomogeneous elastic solid, Jour. Appl. Mech. 42 (1974) 1019?1024.
4. Popov, G. Ia., Axisymmetric contact problem for an elastic inhomogeneous half-space in the presence of cohesion, Jour. Appl. Math. and Mech. 37 (1973) 1052?1059.
5. Singh, B. M., The Reissner-Sagoci problem for a nonhomogeneous solid. Defence Sci. Jour. 22 (1972) 81?86.