1. D. Walten and E. Ellison, Initiation and Propagation of Fatigue Crack, International Metallurgical Review, No. 17 (1972).
2. P. Paris and F. Erdogan, Critical Analysis of the Laws of Crack Propagation, Theoretical Foundations of Engineering Calculations, Series D,85, (1963).
3. Ch. Irwin, Theoretical Foundations of Engineering Calculations, Series D,92, No. 2 (1970).
4. P. Paris, Boeing Company, Document N. B-17867, Addendum, N, September, 1957.
5. A. A. Gudkov and V. S. Zoteev, in: Proceedings of TsNII ChM, No. 3, Metallurgiya, Moscow (1974).