1. F. A. Cotton, G. Wilkincon, C. A. Murillo, and M. Bochmann, Advanced Inorganic Chemistry (Wiley, 1999).
2. S. J. Lippard and J. M. Berg, Principles of Bioinorganic Chemistry (Univ. Sci. Books, Mill Valley, CA, 1994).
3. Chem. Rev. 104(2) (2004).
4. R. H. Holm, P. Kennepohl, and E. I. Solomon, Chem. Rev. 96, 2239 (1996).
5. A. F. Pozharskii, Theoretical Foundations of Heterocyclic Chemistry (Khimiya, Moscow, 1985) [in Russian].