1. S. F. Kukushkin, V. N. Bessolov, and A. V. Osipov, Fiz. Tverd. Tela 43, 2135 (2001) [Phys. Solid State 43, 2229 (2001)].
2. V. N. Bessolov, Yu. V. Zhilyaev, and E. V. Konenkova, Pis’ma Zh. Tekh. Fiz. 27(23), 66 (2001) [Tech. Phys. Lett. 27, 1010 (2001)].
3. S. Yu. Karpov, R. A. Talalaev, Yu. Makarov, J. Massies, and B. Damilano, Surf. Sci. 450, 191 (2000).
4. R. Shechar and K. F. Jensen, Surf. Sci. 381, 161 (1997).
5. I. A. Bobrovnikova and I. V. Ivonin, Izv. Vyssh. Uchebn. Zaved., Ser. Fiz. 46(6), 44 (2003).