1. (a) Gmelin Handbook of Inorganic Chemistry, Borverbindungen, Vols. 2 (1974), 6 (1975), 11 (1977), 12 (1977) and Chs. in the first and second supplements (1980–1983), Springer, Berlin;
2. (b) R.N. Grimes, in Carboranes, Academic Press, New York, 1970, Ch. 6 and literature cited therein.
3. W.E. Hill, F.A. Johnson and R.W. Novak, Inorg. Chem., 14 (1975) 1244.
4. H.C. Beachell and B.F. Dietrick, J. Am. Chem. Soc., 84 (1962) 180.
5. H.C. Beachell and D.E. Hoffman, J. Am. Chem. Soc., 83, (1961) 1347.