1. Johnston, H. Science 173, 517–522 (1971).
2. Roscoe, H. K. Geophys. Res. Lett. 9, 901–902 (1982).
3. Laane, J. & Ohlsen, J. R. Prog. inorg. Chem. 27, 465–513 (1980).
4. Murcray, D. G., Goldman, A., Blatherwick, R. D., Murcray, F. J. & Bonomo, F. S. High Resolution Infrared Laboratory Spectra (Department of Physics, University of Denver, 1984).
5. Connell, P. S. Lawrence Berkeley Lab. Publ. LBL-904 (1979).