1. (a) I. Sóvágó, in: K. Burger (Ed.), Biocoordination Chemistry: Coordination Equilibria in Biologically Active Systems, Ellis Horwood, Chichester, 1990, pp. 135–184.
2. (b) L.D. Pettit, J.E. Gregor, H. Kozlowski, in: R.W. Hay, J.R. Dilworth, K.B. Nolan (Eds.), Perspectives in Bioinorganic Chemistry, vol. 1, JAI Press, London, 1991, pp. 1–41.
3. (a) E.W. Wilson, Jr., M.H. Kasperian, R.B. Martin, J. Am. Chem. Soc. 92 (1970) 5365.
4. (b) G. Brookes, L.D. Pettit, J. Chem. Soc., Dalton Trans. (1976) 42.
5. B. Radomska, I. Sóvágó, T. Kiss, J. Chem. Soc., Dalton Trans. (1990) 289.