1. M. N. Hughes, The Inorganic Chemistry of Biological Processes, 2nd edn., Wiley, New York (1981).
2. Yu. I. Bratushko, Coordination Compounds of 3d Transition Metals with Molecular Oxygen [in Russian], Naukova Dumka, Kiev (1987).
3. V. I. Baranovskii, O. V. Sizova, A. I. Panin, and N. V. Ivanova, Zh. Strukt. Khim.,31, No. 1, 3?11 (1990).
4. O. V. Sizova, N. V. Ivanova, and V. I. Branovskii, Zh. Strukt. Khim.,24, No. 14, As in Russian original?Translator. 125?127 (1983).
5. J. Almlof, B. Roos, and P. Siegbahn, University of Stockholm, Institute of Physics Report 77-33 (1977).