1. K. L. Mittal, ASTM STP 640 (American Society for Testing and Materials, Philadelphia, 1978) p. 5.
2. R. J. Good, ASTM STP 640 (American Society for Testing and Materials, Philadelphia, 1978) p. 18.
3. D. M. Mattox, ASTM STP 640 (American Society for Testing and Materials, Philadelphia, 1978) p. 54.
4. J. J. Bikerman, ASTM STP 640 (American Society for Testing and Materials, Philadelphia, 1978) p. 30.
5. M. Arcan, Z. Hashin andA. Voloshin,Exp. Mech. 18 (1978) 141.