1. P. V. Gel’d, R. A. Ryabov, and L. P. Mokhracheva, Hydrogen and Physical Properties of Metals and Alloys (Nauka, Moscow, 1985) [in Russian].
2. M. Ito, D. Setoyama, J. Matsunana, H. Muta, K. Kirosaki, M. Uno, and S. Yamanaka, J. Alloys Compd. 420, 25 (2007).
3. V. A. Gubanov, A. L. Ivanovskiĭ, and M. V. Ryzhkov, Quantum Chemistry in Materials Science (Nauka, Moscow, 1987) [in Russian].
4. H. L. Yakel, Acta Crystallogr. 11, 46 (1958).
5. Z. M. Azarkh and P. I. Gavrilov, Kristallografiya 15(2), 275 (1970) [Sov. Phys. Crystallogr. 15 (2), 231 (1970)].