1. Zlomanov, V.P. and Novoselova, A.V., P-T-x-diagrammy sostoyaniya metall-khal’kogen (P-T-x Phase Diagrams of Metal-Chalcogen Systems), Moscow: Nauka, 1987.
2. Kröger, F.A., The Chemistry of Imperfect Crystals, Amsterdam: North-Holland, 1964.
3. Levinskii, Yu.V., P-T-X diagrammy sostoyaniya dvoinykh metallicheskikh sistem (P-T-X Phase Diagrams of Binary Metallic Systems), Moscow: Metallurgiya, 1990.
4. Brebrick, R.F., Non-Stoichiometry in Binary Semiconductor Compound N0.5 − δM0.5 + δ, Prog. Solid State Chem., 1966, vol. 3, pp. 213–263.
5. Grinberg, Ya.Kh., Lazarev, V.B., and Gus’kov, V.N., Vapor Composition over Nonstoichiometric Crystals and Deviations from Stoichiometry Studied by Vapor Pressure Measurements, Dokl. Akad. Nauk SSSR, 1982, vol. 262, no. 2, pp. 371–373.