References
- Broser , I. and Reichardt , W. 1954 . Z Physik , 134 : 222
- Dvorak , L. and Zelikin , J. M. 1973 . Czech. J. Phys. , B23 : 781
- Sodomka , L. 1964 . Czech. J. Phys. , B14 : 352
- Goldberg , P. 1969 . J. Electrochem. Soc. , 106 : 34
- Sekine , T. and Kotera , Y. 1976 . J. Luminescence , 12/13 : 929
- Drickamer , H. G. and Frank , C. W. 1973 . Electronic transitions and the High Pressure Chemistry and Physics of Solids , New York : Halsted Press .