1. E. K. Arushanov, Prog. Cryst. Growth Charact. 3, 211 (1981).
2. V. B. Lazarev, V. Ya. Shevchenko, Ya. Kh. Grinberg, and V. V. Sobolev, The II–V Semiconductor Compounds (Moscow, 1976) [in Russian].
3. V. V. Sobolev, Energy Structure of Narrow-Gap Semiconductors (Shtiintsa, Chisinau, 1983) [in Russian].
4. M. Stakelberg and P. Paulus, Z. Phys. Chem. (Leipzig) 28, 5427 (1935).
5. G. A. Steigman and J. Gooder, Acta Crystallogr. B 24, 1062 (1968).