1. Perel'man, F.M., Zvorykina, A.Ya., and Rudina, P.V., Kobal't (Cobalt), Moscow: Akad. Nauk SSSR, 1949.
2. Lazarev, V.B., Krasov, V.G., and Shaplygin, I.S., Elektroprovodnost' okisnykh sistem i plenochnykh struktur (Electrical Conductivity of Oxide Systems and Film Structures), Moscow: Nauka, 1979.
3. Tret'yakov, Yu.D., Khimiya nestekhiometricheskikh okislov (Chemistry of Nonstoichiometric Oxides), Moscow: Moscow State University, 1974.
4. Semiconductors, Hannay, N., Ed., New York: Reinhold, 1959. Translated under the title Poluprovodniki, Moscow: Inostrannaya Literatura, 1962, p. 667.
5. Andreeva, A.F. and Gil'man, I.Ya., Some Properties of Films Prepared from Higher Oxides of Rare-Earth Elements through Reaction Evaporation, in Tugoplavkie soedineniya RZM (High-Melting Compounds of Rare-Earth Metals), Novosibirsk: Nauka, 1979, pp. 132–135.