1. Elber, W., Engineering Frac. Mech., 2, 37 (1970).
2. Elber, W., ASTM STP 486, ASTM, 230 (1971).
3. Buck, O., Ho, C.L., Marcus, H.L. and Thompson, R.B., ASTM STP 513, 280 (1972).
4. Buck, O., Ho, C.L. and Marcus, H.L., J. Eng. Fract. Mechs., 5, 23 (1973).
5. Buck, O., Frandsen, J.D., Ho, C.L. and Marcus, H.L., Proc. 3rd Int. Conf. on the Strength of Metals and Alloys, 1, The Instititue of Metals, Iron and Steel, 462 (1973).