1. J. Callaway,Energy Band Theory, Academic Press, New York (1964).
2. V. V. Nemoshkalenko and V. N. Antonov,Band Structure of Metals [in Russian], Kiev (1985).
3. I. V. Abarenkov, I. M. Antonova, and V. G. Bar'yakhtar,Electronic Structure of Perfect and Imperfect Crystals [in Russian], Kiev (1991).
4. J. C. Phillips,Sol. St. Phys.,18, 55–164 (1966).
5. Semicond. and Semimet.,3, 488 (1967).