1. R. Thomson, J. Mater. Sci. 13 (1978) 128.
2. ASME-AMD, Vol. 19,1976
3. J. Weertman, Acta Met. 26 (1978) 1731.
4. J. R. Rice, ?Fatigue Crack Propagation,? ASTM STP 415 (American Society for Testing and Materials, Philadelphia, 1976) p. 247.
5. J. Weertman, in ?Fatigue and Microstructure? (American Society for Metals, Ohio, 1979) p. 279.