1. 1) J. Völkel and G. Alefeld: Hydrogen in Metals, Ed. by G. Alefeld and J. Völkel, Springer Verlag, (1978), p. 321;
2. J. Völkel and G. Alefeld: Diffusion in Solids, Ed. by A. S. Nowick and J. J. Burton, Academic Press, N.Y., (1975), p. 260 and references there in.
3. 2) R. W. Lin and H. H. Johnson: Advanced Techniques for Characterizing Hydrogen in Metals, Ed. by N. F. Fiore and B. J. Berkowitz, Metal. Soc. AIME, (1982), p. 105.
4. 3) M. Surkein and R. Heidersback: Advanced Techniques for Characterizing Hydrogen in Metals, Ed. by N. F. Fiore and B. J. Berkowitz, Metal. Soc. AIME, (1982), p. 119.
5. 4) M. A. Pick: Metal Hydrides, Plenum Press, N.Y., (1981), p. 325.