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2. D.P. Pook and D.J. Cartwright: Compendium of Stress Intensity Factors, The Hillington Press, Uxbridge (1976).
3. I.F. Smith: in Proceedings of the 3rd International Conference on Numerical Methods in Fracture Mechanics, A.R. Luxmoore, D.R.J. Own (eds), Pineridge Press, Swansea, UK (1984) pp 561–574.
4. J.D. Burk and F.V. Lawrence: Welding Journal 56, No. 2 (1977) 43s-51s.
5. ASTM STP;G. Glinka,1979