1. Muminov, M.I. and Sandalov, V.N., Pis’ma Zh. Tekh. Fiz., 2003, vol. 29, no. 16, p. 63 [Tech. Phys. Lett. (Engl. Transl.), vol. 29, p. 687].
2. Zil’berman, M.I. and Kostyukov, N.S., Elektron. Tekh. Ser. 14. Mater. (Neorg. Dielektriki), 1971, no. 4, p. 56.
3. Muminov, M.I., Mukhamedzhanov, M.A., Skripnikov, Yu.S., and Kostyukov, N.S., Izv. UzSSR Akad. Nauk, Ser. Fiz. Mat., 1983, no. 5, p. 72.
4. Rakhovskaya, O.V., Elovikov, S.S., Dubinina, E.M., et al., Surf. Sci., 1992, vol. 274, no. 1, p. 190.
5. Sergeev, I.N., Akhkubekov, A.A., Kumykov, V.K., and Sozaev, V.A., in Proc. X Int. Symp. “Order, Disorder, and Properties of Oxides” (ODPO-10), Rostov-on-Don, Loo, 2007, Rostov-on-Don: IPO PI YuFU, 2007, Part III, p. 91.