1. Y. N. RUMYANTSEV, G. H. ZHITENEVA and V. P. KOCHKIN,Akad. Nauk SSSR Vostochno-Sibirskii Filial, Irkutsk Trudy 25 (1960) 110.
2. R. A. ISAKOVA, V. N. NESTEROV and A. S. SHENDIAPIN,Zh. Neorg. Khim. 8 (1963) 18.
3. A. R. MILLER and A. W. SEARCY,J. Phys. Chem. 67 (1963) 2400.
4. R. COLIN and J. DROWART,Trans. Faraday Soc. 64 (1968) 2611.
5. A. S. PASHINKIN,Zh. Phis. Khim. 88 (1964) 2690.