1. For a general discussion of electron transfer processes see a) Eberson, L. Electron Transfer Reactions in Organic Chemistry, Springer, Berlin 1987.
2. Cannon, R.D. Electron Transfer Reactions, Butterworths, London 1980.
3. Minisci, F.; Citterio, A. Adv. Free Radical Chem. 1980. 6, 65.
4. Adams, G.E.; Breccia, A.; Rimondi, C. (Eds.) Advanced Topics in Hypoxic Cell Radiosensiiizarion, Plenum, New York 1982.
5. Wardman, P.; Clarke, E.D. In New Chemo-and Radiosensitizing Drugs’, Breccia, A.; Fowler, J.F., Eds., Edizione Scientifiche: Lo Scarabeo, Italy, 1985, p. 21.