1. A. V. Andreev, Usp. Fiz. Nauk 145, 113 (1985) [Sov. Phys. Usp. 28, 70 (1985)].
2. A. P. Petrakov and E. A. Golubev, Poverkhnost: Fiz. Khim. Mekh., No. 9, 15 (2000).
3. V. A. Bushuev and A. P. Petrakov, Fiz. Tverd. Tela (St. Petersburg) 35, 355 (1993) [Phys. Solid State 35, 181 (1993)].
4. V. A. Bushuev and A. P. Petrakov, Zh. Tekh. Fiz. 70(5), 28 (2000) [Tech. Phys. 45, 613 (2000)].
5. A. A. Lomov, V. A. Bushuev, and V. A. Karavanskii, Kristallografiya 45, 915 (2000) [Crystallogr. Rep. 45, 842 (2000)].