1. Narrow-Gap Semiconductors and Their Applications [Russian translation], Mir, Moscow, 1969.
2. R. Dornhaus and G. Nimtz, Springer Tracts in Mod. Phys. 98, 119 (1983).
3. I. M. Tsidilkovski, G. I. Harus, and N. G. Shelushina, Adv. Phys. 34, 43 (1985).
4. L. A. Bovina and V. I. Stafeev, in The Physics of II–V Compounds [in Russian], edited by A. N. Georgobiani and M. K. Sheinkman, Nauka, Moscow, 1986, p. 246.
5. V. I. Ivanov-Omskii, B. I. Ivanov, V. K. Ogorodnikov, and K. P. Smekalova, in Proceedings of the 1st All-Union Symposium on Narrow-Gap Semiconductors and Semimetals [in Russian], L’vov State University, L’vov, 1975, Part 3, p. 47.