1. M. Cieslak-Golonka, J. Thermal Anal., 38 (1992) 2501.
2. V. V. Boldyrev, Kinet. Katal., 6 (1965) 934.
3. V. V. Boldyrev, Kinet. Katal., 8 (1967 1179.
4. A. B. P. Lever, Inorganic Electronic Spectroscopy (2nd ed.) Elsevier, Amsterdam-Oxford-New York-Tokyo 1984.
5. J. Myrczek, Spectrosc. Lett., 23 (1990) 1027.