1. Alefeld, G., Völk, J. (eds.): Hydrogen in metals I, II. Berlin, Heidelberg, New York: Springer 1978
2. For a review of earlier work see Lewis, F.A.: The palladium hydrogen system. London, New York: Academic Press 1967
3. Frieske, H., Wicke, E.: Ber. Bunsenges. Phys. Chem.77, 48 (1973)
4. Lacher, J.R.: Proc. R. Soc.161, 525 (1937)
5. Libowitz, G.G.: J. Appl. Phys. Suppl.33, 399 (1962)