1. Holm RH, Solomon El (eds) (1996) Chem Rev 96:2237–3042
2. Da Silva JJRF, Williams RJP (1991) The biological chemistry of the elements. Clarendon Press, Oxford
3. Lippard SJ, Berg JM (1994) Principles of bioinorganic chemistry. University Science Books, Sausalito, Calif
4. Glusker JP (1991) Adv Protein Chem 42:1–76
5. Kretsinger RH, Kockolds CE (1973) J Biol Chem 248:3313–3326