1. For general discussions see: (a) E.W. Abel, F.G.A. Stone, G. Wilkinson (Eds.), Comprehensive Organometallic Chemistry I, vol. 1, Pergamon, Oxford, 1982.
2. (b) E.W. Abel, F.G.A. Stone, G. Wilkinson (Eds.), Comprehensive Organometallic Chemistry II, vol. 1, Pergamon, Oxford, 1995.
3. (c) R.N. Grimes, Carboranes, Academic Press, New York, 1970.
4. (d) T. Onak, Gmelin Handbook of Inorganic Chemistry, Boron Compounds—(1st Suppl.), vol. 3, Springer–Verlag, New York, 1981 (Chapter 13).
5. (a) N.S. Hosmane, J.A. Maguire, Electron–Deficient Boron and Carbon Clusters, in: G.A. Olah, K. Wade, R.E. Williams (Eds.), Wiley, New York, 1991 (Chapter 9).