1. R. W. Hay, in: Comprehensive Coordination Chemistry, Vol. 6 (G. Wilkinson, R. D. Gillard, and J. A. McCleverty, eds.), Pergamon Press, Oxford (1988).
2. J. Chin and X. Zou, J. Am. Chem. Soc., 110, 223 (1988).
3. P. R. Norman, Inorg. Chim. Acta, 130, 1, (1987).
4. P. R. Norman, Inorg. Chim. Acta, 145, 7 (1988).
5. P. R. Norman, A. Tate, and P. Rich, Inorg. Chim. Acta, 145, 211 (1988).