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- [4] FAR INFRARED SPECTRA OF AL2O3 - CR3+ AND AL2O3 - TI3+ PHYSICAL REVIEW, 1967, 156 (02): : 298 - &
- [6] FAR-INFRARED EPR OF AL2O3=MN3+ AND GAMMA-IRRADIATED RUBY PHYSICAL REVIEW B, 1975, 12 (07): : 2588 - 2595