1. Adamson, A. W., Waltz, W. L., Zinato, E., Watts, D. W., Fleischauer, P. D., Lindholm, R. D.: Chem. Reviews68, 541 (1968).
2. Valentine, D.: Advances Photochem.6, 124 (1968).
3. Balzani, V., Carassiti, V., Scandola, F.: Gazz. chim. ital.96, 1213 (1966).
4. Ballhausen, C. J.: Introduction to ligand field theory. New York: McGraw-Hill 1962.
5. Jørgensen, C. K.: Absorption spectra and chemical bonding in complexes. Oxford: Pergamon 1962.