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2. T. Graham: Proc. Roy. Soc. (London) 16, 422 (1868) or Phil. Mag. 36, 63 (1868) or C. R. Acad. Sci. 66, 1014 (1868) or Ann. Chim. Phys. 14, 315 (1868)
3. e.g. W.Mueller, P.Blackledge, G.Libowitz: Metal Hydrides (Academic Press, New York, London 1968)
4. For details see: Proceedings: The Hydrogen Economy, Miami Energy Conf. THEME (Univ. of Miami, Coral Gables, Florida 1974)
5. H.Ewe, E.W.Justi, K.Stephan: Energy Conversion 13, 109 (1973)