1. É. I. Adirovich, É. M. Mastov, and Yu. M. Yuabov, Fiz. Tekh. Poluprovodn. 5(7), 1415 (1971) [Sov. Phys. Semicond. 5, 1241 (1971)].
2. É. I. Adirovich, Fiz. Tekh. Poluprovodn. 4(4), 745 (1970) [Sov. Phys. Semicond. 4, 629 (1970)].
3. É. I. Adirovich, É. M. Mastov, and Yu. M. Yuabov, Dokl. Akad. Nauk SSSR 188, 1254 (1969).
4. I. A. Karpovich and M. V. Shilova, Izv. Vyssh. Uchebn. Zaved., Fiz. 4, 128 (1969).
5. V. V. Osipov, A. Yu. Selyakov, and M. Foygel, Fiz. Tekh. Poluprovodn. 32(2), 221 (1998) [Semicond. 32, 201 (1998)].