1. G. Jerkiewicz, Prog Surf Sci 57, 137 (1998)
2. T.N. Veziroglu, J. O’M, D.S. Bockris, Solar hydrogen energy (Optima, New York, 1991)
3. G. Alefeld, J. Volkl (eds.), Hydrogen in metals, part I and II (Springer, New York, 1978)
4. L. Schlapbach (ed.), Hydrogen in intermetalic compounds. Part I (Springer, New York, 1988). Part II, Springer, New York, 1992
5. K.M. Mackay, Hydrogen compounds of the metallic elements (E.&F.N. Spon, London, 1966)