1. V. M. Fridkin and B. N. Popov, Usp. Fiz. Nauk 126, 657 (1978).
2. B. I. Sturman and V. M. Fridkin, Photovoltaic Effect in Media without a Center of Symmetry and Related Phenomena (Nauka, Moscow, 1992) [in Russian].
3. S. G. Odulov and O. I. Oleinikov, Kvantovaya Elektron. 10 (7), 1498 (1983).
4. R. M. Magomadov, S. N. Tsebaev, and R. R. Del’mikhanov, Proc. Int. Conf. “Innovatika 2011,” Ul’yanovsk, 2011, Vol. 2, p. 36.
5. K. V. Shalimova, Physics of Semiconductors (Energiya, Moscow, 1976) [in Russian].