1. M. Di Giulio, G. Micocci, A. Rizzo, and A. Tepore, J. Appl. Phys. 54, 5839 (1983).
2. V. L. Bakumenko and V. F. Chishko, Fiz. Tekh. Poluprovodn. 11, 2000 (1977) [Sov. Phys. Semicond. 11, 1171 (1977)].
3. V. N. Katerinchuk and M. Z. Kovalyuk, Pis’ma Zh. Tekh. Fiz. 18(12), 70 (1992) [Sov. Tech. Phys. Lett. 18, 394 (1992)].
4. M. V. Tovarinitskii, V. K. Luk’yanyuk, Z. D. Kovalyuk, V. I. Vitkovskaya, and S. Ya. Golub, Pis’ma Zh. Tekh. Fiz. 14, 2104 (1988) [Sov. Tech. Phys. Lett. 14, 914 (1988)].
5. V. I. Gavrilenko, A. M. Grekhov, D. V. Korbutyak, and G. G. Litovchenko, Optical Properties of Semiconductors [in Russian], Naukova Dumka, Kiev (1987).