1. V. I. Kosintsev, V. I. Gaman, and V. M. Kalygina, Amorphous Semiconductors-84, Vol. 2, [in Russian], Gabrovo, Bulgaria (1984), pp. 306?308.
2. V. I. Gaman, V. M. Kalygina, and V. I. Kosintsev, Vitreous Semiconductors [in Russian], Leningrad (1985), pp. 206?208.
3. V. M. Kalygina, V. I. Kosintsev, V. I. Gaman, and O. E. Modebadze, Izv. Vyssh. Uchebn. Zaved., Fiz., No. 7, 123?125 (1981).
4. V. I. Kosintsev, V. M. Kalygina, V. I. Gaman, and O. E. Modebadze, Izv. Vyssh. Uchebn. Zaved., Fiz., No. 5, 85?89 (1982).
5. V. I. Kosintsev, V. I. Gaman, V. M. Kalygina, and O. E. Modebadze, Izv. Vyssh. Uchebn. Zaved., Fiz., No. 5, 90?94 (1982).