1. D. F. Shriver, H. D. Kaesz and R. D. Adams, The Chemistry of Metal Cluster Complexes, VCH Publishers, New York, 1990.
2. D. M. P. Mingos and D. J. Wales, Introduction to Cluster Chemistry, Prentice Hall, Englewood Cliffs, New Jersey, 1990.
3. D. Fenske and H. Krautscheid, Angew. Chem. Int. Ed. Engl, 29, 1452 (1990).
4. D. M. P. Mingos, Acc. Chem. Res., 17, 311 (1984).
5. D. M. P. Mingos and Lin Zhenyang, J. Chem. Soc., Dalton Trans., 1657 (dy1988).