1. F. Cotton and G. Wilkinson, Advanced Inorganic Chemistry – A Comprehensive text, (John Wiley & Sons, USA, 1980).
2. R. C. Brasted, Comprehensive Inorganic Chemistry 8, D. Van Nostrand Co., USA (1961).
3. Materials World, Published by IOM Communications Ltd., London, April (2005).
4. Peter Turmezei, Acta Polytechnica Hungarica 1, 13–16 (2004).
5. K. D. Tsendin and D. V. Denisov, Journal of Optoelectronics and Advanced Materials 5, 1011–1016 (2003)