1. K. Nakamoto, Infrared Spectra of Inorganic and Coordination Compounds, 2nd ed., Wiley (1970).
2. M. Tsuboi, J. Amer. Chem. Soc.,79, 135 (1957).
3. D. M. Jost and H. Russel, Systematic Inorganic Chemistry, Prentice-Hall, New York (1946).
4. L. W. Daash and D. L. Smith, Anal. Chem.,3, 853 (1951).
5. J. Pokorny, Chem. Zvesti,19, 628 (1965).