1. W. M. Mueller, J. P. Blackledge, G. G. Libowitz: Metal Hydrides (Academic Press, New York-London 1968)
2. F. A. Lewis: The Palladium Hydrogen System (Academic Press, New York-London 1967)
3. J. Callaway: Energy Band Theory (Academic Press, New York-London 1964)
4. J. Less-Common Metals 49, 1/2 (1976);
5. Conference Proceedings Hydrogen in Metals, Jan. 5???6, 1976 Birmingham, UK