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2. R. P. Frohmberg, W. J. Barnett, and A. R. Troiano: Delayed Failure and Hydrogen Embrittlement in Steel. ASM Trans., 1955, vol. 47, p. 892.
3. E. R. Slaughter, E. E. Fletcher, A. R. Elsea, and G. K. Manning: An Investigation of the Effects of Hydrogen on the Brittle Failure of High-Strength Steels. Battelle Memorial Institute Quarterly Report No. 4 to WADC, 1954.
4. C. A. Zapffe and M. E. Haslem: Acid Composition, Concentration Temperature, and Pickling Time as Factors in the Hydrogen Embrittlement of Mild Steel and Stainless Steel Wire. ASM Trans., 1947, vol. 39, p. 213.
5. R. E. Peterson: Stress Concentration Design Factors. John Wiley & Sons Inc. New York, 1953.