1. H. Asano, Y. Ishino, R. Yamada, M. Hirabayashi, J. Solid State Chem. 15, 45 (1975)
2. T. Schober, H. Wenzl in: Hydrogen in Metals (G. Alefeld and J. Völkl, eds.), Springer, Berlin (1978)
3. W.A. Oates, J.A. Lambert and P.T. Gallagher, Trans. Met. Soc. AIME 245, 47 (1969)
4. K. Sköld in same ref. as 2
5. R.C. Bowman Jr., in Metal Hydrides (G. Bambakidis, ed.) Plenum, New York (1981)