1. D. A. Grigor’ev and S. A. Kukushkin, Zh. Tekh. Fiz. 68(7), 111 (1998) [Tech. Phys. 43, 846 (1998)].
2. A. P. Belyaev, V. P. Rubets, and I. P. Kalinkin, Zh. Tekh. Fiz. 71(4), 133 (2001) [Tech. Phys. 46, 495 (2001)].
3. A. P. Belyaev, V. P. Rubets, M. Yu. Nuzhdin, and I. P. Kalinkin, Fiz. Tverd. Tela (St. Petersburg) 43, 745 (2001) [Phys. Solid State 43, 778 (2001)].
4. S. A. Kukushkin and A. V. Osipov, Usp. Fiz. Nauk 168, 1083 (1998) [Phys. Usp. 41, 983 (1998)].
5. S. A. Kukushkin, Fiz. Tverd. Tela (St. Petersburg) 35, 1582 (1993) [Phys. Solid State 35, 797 (1993)].