1. G. I. Ovchinnikova, N. V. Belugina, and A. L. Tolstikhina, in Proc. of the 6th All-Russ. School-Seminar on Physics and Application of Microwaves 2007 (MGU, Moscow, 2007), Part 9, p. 9.
2. G. I. Ovchinnikova, V. K. Novik, Yu. A. Pirogov, and A. N. Soloshenko, Izv. Akad. Nauk, Ser. Fiz. 64, 2452 (2001).
3. A. L. Tolstikhina, N. V. Belugina, and R. V. Gainutdinov, Poverkhnost’. Rentgen. Sinkhrotron. Neitron. Issled., No. 12, 19 (2000).
4. V. N. Boiko, Yu. V. Gorokhov, G. I. D’yakonov, and G. I. Ovchinnikova, Fiz. Tverd. Tela 28, 2550 (1986) [Sov. Phys. Solid State 28, 1262 (1986)].
5. A. A. Potapov, Khim. Fiz. 10, 1410 (1991).