1. M. E. Mackay, T. G. Teng and J. M. Schultz, J. Mater. Sci. 14 (1979) 221.
2. M. D. Skibo, R. W. Hertzberg, J. A. Manson and S. L. Kim, ibid. 12 (1977) 531.
3. R. W. Hertzberg, M. D. Skibo and J. A. Manson, ?Fatigue Mechanisms?, edited by J. T. Fong (American Society for Testing and Materials, Kansas City, Missouri, 1979).
4. A. S. Holik, R. P. Kambour, D. G. Fink and S. Y. Hobbs, ?Microstructural Science?, Vol. 7, (Elsevier, Amsterdam, New York and Oxford, 1978).
5. J. R. Rice, ?Fatigue Crack Propagation? (American Society for Testing and Materials, Atlantic City, New Jersey, 1967).