1. C. J. Allègre, S.H. Schneider, Sci. Am. 271(4) (1994) 44: The evolution of the earth
2. E.F. Elstner: Der Sauerstoff: Biochemie, Biologie, Medizin, Bl-Wiss.-Verlag, Mannheim, 1990
3. D. T. Sawyer: Oxygen Chemistry, Oxford University Press, Oxford, 1991
4. J.J.R. Fraüsto da Silva, R.J.P. Williams: The Biological Chemistry of the Elements, Clarendon Press, Oxford, 1991
5. Taube, Prog. Inorg. Chem. 34 (1986) 607: Interaction of dioxygen species and metal ions - equilibrium aspects