1. G. V. Samsonov, I. F. Pryadko, and L. F. Pryadko, A Configuration Model of a Substance [in Russian], Naukova Dumka, Kiev (1971).
2. N. A. Galaktionova, Hydrogen in Metals [in Russian], Metallurgizdat, Moscow (1959).
3. I. S. Slabkovakii, ?The influence of hydrogen on the electron structure of nickel, iron, and cobalt,? Author's Abstract of Candidate in Technical Sciences Thesis, L'vov (1971).
4. B. Baranowski, ?Disintegration of nickel hydride under high pressure,? Bull. Acad. Pol. Sci. Ser. Sci. Chem.,10, No. 8, 451?455 (1962).
5. V. V. Fedorov, V. M. Sidorenko, and V. I. Pokhmurskii, ?The formation of ?-phase in nickel in hydrogen impregnation from a gaseous medium,? Fiz.-Khim. Mekh. Mater., No. 5, 83?85 (1977).