1. 10) G. A. NELSON : Hydrogen Plants Steels, Proc. API, 29M III (1949), p. 163
2. 11) API Publication 941, Third ed. (1983-5)
3. 12) L. C. WEINER : Corrosion, 17 (1961), p. 137
4. 13) R. E. ALLEN, R. J. JANSEN, P. C. ROSENTHAL and F. H. VITOVEC : API Proc. 41 [III] (1961), p. 74
5. 18) F. H. VITOVEC : Current Solutions to Hydrogen Problems in Steels, ed. by C. G. INTERRANT and G. M. PRESSOUYRE (1982), p. 236 [ASM]