1. M.A. Pennella, D.P. Giedroc, D.S. Auld, J. Burgess, R.H. Prince. In Encyclopedia of Inorganic Chemistry, R.B. King (Ed.), Vol. IX, 2nd Edn, pp. 5867–5949, Wiley, Hoboken, NJ (2005).
2. J. Emsley. In Nature’s Building Blocks: An A-Z Guide to the Elements, pp. 499–505, Oxford University Press, Oxford (2003).
3. W. Kaim, B. Schwederski. In Bioinorganic Chemistry: Inorganic Elements in the Chemistry of Life, G. Meyer, A. Nakamura (Eds.), pp. 1–38, Wiley, New York (1994).
4. B.L. Vallee, W. Maret, I. Bertini, C. Luchinat, M.S. Viezzoli. In Zinc Enzymes, I. Bertini, C. Luchinat, W. Maret, M. Zeppezauer (Eds.), pp. 1–47, Birkhauser, Boston, MA (1986).