1. R. W. Hay,Bio-Inorganic Chemistry, Ellis Horwood, Chichester, 1984.
2. W. N. Lipscombe,Chem. Soc. Rev., 1, 319 (1972).
3. W. N. Lipscombe,Tetrahedron, 30, 1725 (1974).
4. R. W. Hay and P. J. Morris in H. Sigel (Ed.),Metal Ions in Biological Systems, Vol. 5, Marcel Dekker, New York, N.Y., 1976.
5. D. A. Buckingham in A. W. Addison, W. R. Cullen, D. Dolphin and B. R. James (Eds.),Biological Aspects of Inorganic Chemistry, Wiley-Interscience, New York, N.Y. 1977.