1. Z. R. Grabowski, K. Rotkiewicz, A. Siemiarczuk, D. J. Cowley, and W. Baumann (1979)Nouv. J. Chim. 3, 443.
2. W. Rettig (1986)Angew. Chem. 98, 969;Angew. Chem. Int. Edit. Engl. 25, 971.
3. E. Lippert, W. Rettig, V. Bonaĉić-Koutecký, F. Heisel, and J. A. Miché (1987)Adv. Chem. Phys. 68, 1.
4. W. Rettig (1994) in J. Mattay (Ed.),Topics in Current Chemistry, Photoinduced Electron Transfer, Springer Verlag, Berlin, p. 253.
5. W. Rettig and W. Baumann (1992) in J. F. Rabek (Ed.),Photochemistry and Photophysics, Vol. VI, CRC Press, Boca Raton, FL, p. 79.