1. W.M. Müller, J.P. Blackledge, G.G. Libowitz: Metal Hydrides (Academic Press, New York 1968)
2. J. Friedel: Phil. Mag. 43, 153 (1952); Ber. Bunsenges. Phys. Chemie 76, 828 (1972)
3. N.N. Engel, J.E. Johnston: In EHydrogène dans les Métaux, Congrès International Paris, ed. by P. Bastien, Science et Industrie, Paris (1972)
4. Topics Appl. Phys.;A.C. Switendick,1978
5. NATO Conference Series VI;J.H. Weaver,1983