1. A. M. Stoneham,Theory of Defects in Solids. Electronic Structure of Defects in Insulators and Semiconductors, Clarendon Press, Oxford (1975).
2. G. M. Zhidomirov and I. D. Mikheikin,Cluster Approximation in Quantum Chemical Studies of Chemisorption and Surface Structures [in Russian], Vol. 9, VINITI, Moscow (1984).
3. R. A. Évarestov, E. A. Kotomin, and A. N. Ermoshkin,Molecular Models of Point Defects in Broad-Crack Solids [in Russian], Zinatne, Riga (1983).
4. T. Hoshino and K. Suzuki,J. Phys. Soc. Jpn.,47, 1141–1151 (1974).
5. R. Haydock, V. Heine, M. J. Kelly,J. Phys. C: Solid State Phys.,5, 2845–2858 (1972).