1. 1) E. Fujita: Mechanism of Hydrogen-induced delayed Cracking, Ed. by Delayed Cracking Committee, the joint group for basic Research of Iron and Steel, JISI (1975), 10;
2. E. Fujita: Mechanism of Hydrogen-induced delayed Cracking, Ed. by Delayed Cracking Committee, the joint group for basic Research of Iron and Steel, JISI (1975), 5.
3. 2) M. Nagumo: Metal and Hydrogen, Ed. by Japan Institute of Metals, (1974), p. 106.
4. 3) A. R. Troiano: Trans. ASM, 52 (1960), 54.
5. 4) N. N. Engel and J. E. Johnston: Preprint, Congrés International, Paris, 29 mai-2 juin, (1972), 60.