1. Bashuk, R.P., Grum Grjimailo, S.V., 1966. Wide absorption bands in α-Al2O3 containing ions of the iron group. In: Spectroscopy of Crystals. Nauka, Moscow, pp. 204–210.
2. A review of the optical properties of anion lattice vacancies, and electrical conduction in α-Al2O3;Evans;J. Nucl. Mater,1995
3. Optical properties of F+-center in crystalline Al2O3;Evans;Phys. Rev. B,1978
4. Thermoluminescence of anion-defective corundum under UV, laser and X-ray irradiation;Kortov;Zh. Tekhnich. Fiziki,1997
5. Luminescence of the F-center in Sapphire;Lee;Phys. Rev,1979