1. L.C. Weiner:Corrosion, 1961, vol. 17, pp. 109–15.
2. R.E. Allen, R.J. Jensen, P.C. Rosenthal, and F.H. Vitovec:Proc. API, 1962, vol. 42, pp. 452–62.
3. F.H. Vitovec:Proc. API, 1964, vol. 44, pp. 179–88.
4. D. A. Westphal and F. J. Worjala:Hydrogen in Metals, I. M. Bernstein and A.W. Thompson, eds., ASM, Metals Park, OH, 1974, pp. 78–89.
5. M. Hasegawa and S. Nomura:J. Iron Steel lnst. Jap., 1977, vol. 17, pp. 187–93.