1. V. B. Aleskovskii, Vestn. Akad. Nauk SSSR 6, 48 (1975).
2. A. L. Egorov, Yu. K. Ezhovskii, and S. I. Kol’tsov, Zh. Fiz. Khim. 59, 683 (1985).
3. G. V. Anikeev, Yu. K. Ezhovskii, and S. I. Kol’tsov, Izv. Akad. Nauk SSSR, Neorg. Mater. 24, 619 (1988).
4. E. Granneman, Solid State Technol., No. 5, 92 (2000).
5. J. Gelatos, L. Chen, H. Chung, and R. Thakur, Solid State Technol. 2, 44 (2003).