1. Bandurin, Yu.A., Dashchenko, A.I., Mitropolsky, I.E., and Pop, S.S., Nucl. Instrum. Methods Phys. Res., Sect. B, 1993, vol. 78, p. 159.
2. Bandurin, Yu.A., Dashchenko, A.I., Mitropolsky, I.E., and Pop, S.S., Opt. Spectrosk., 1997, vol. 83, no. 1, p. 38 [Opt. Spectrosc. (Engl. Transl.), vol. 83, no. 1, p. 34].
3. Bandurin, Yu., Lacombe, S., Guillemot, L., and Esaulov, V., Surf. Sci., 2002, vol. 513, p. L413.
4. Shimizu, K., Phys. Rev. B: Condens. Matter Mater. Phys., 1999, vol. 60, 17 091.
5. Almulhem, A.A. and Girardeau, M.D., Surf. Sci., 1989, vol. 210, p. 138.