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2. B. A. Kolachev:Hydrogen Embrittlement of Nonferrous Metals, p. 105, Israel Program for Scientific Translation, Jerusalem, 1968.
3. C. J. Smithells and C. E. Ransley:Proc. Roy. Soc. London, 1935, vol. 152A, p. 706.
4. N. J. Grant:Fracture, Averbach, Feibeck, Hahn, and Thomas, eds., p. 567, Technology Press, Massachusetts Institute of Technology, 1959.
5. R. C. Gifkins: See Ref. 4, p. 588.