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3. J. A. S. Green, H. W. Hayden, and W. G. Montague: Ibid.Effect of Hydrogen on Behavior of Materials 1976, p. 200.
4. M. R. Luthan, Jr. and A. H. Dexter:Met. Trans. A, 1975, vol. 6A, p. 1655.
5. L. Montgrain and P. R. Swann:Hydrogen in Metals, p. 575, ASM, Metals Park, 1974.