1. 4) Soong, T. C., Proc. 15th Ann. Meet. Soc. Engng. Sci., (1978), 267-272.
2. 5) Vaillette, D. P. and Adams. G. G., J. Appl. Mech., Vol.50, No.3, (1983), 693-694.
3. 6) Benson. R. C., Appl. Mech., Vol.48, No.4, (1981), 895-899.
4. 7) Benson. R. C., Appl. Mech., Vol.49, No.1, (1982), 231-232.
5. 8) Love. A. E. H., “A Treatise on Mathematical Theory of Elasticity”, 4th ed., Chapter 19, (1944), Dover., New York.