1. G. J. Sandrock, J. Alloys Compd. 293–295, 877 (1999).
2. K. N. Semenenko, V. N. Verbetskii, and A. V Kochukov, Dokl. Akad. Nauk SSSR 258, 362 (1981).
3. V. N. Verbetskii and S. V. Mitrokhin, Al’tern. Energy. Ekol. 10, 41 (2005).
4. E. Ronnebro and D. Noréus, J. Alloys Compd. 228, 115 (2004).
5. P. Dantzer, in Hydrogen in Metals III: Properties and Applications (Topics in Applied Physics: Book 73), Ed. by H. Wipf (Springer-Verlag, Berlin, 1997), p. 279.