1. Yu. I. Kuzmin, Fiz. Tverd. Tela (St. Petersburg) 43(7), 1157 (2001) [Phys. Solid State 43 (7), 1199 (2001)].
2. A. A. Kozlovskiĭ and V. F. Khirny’ Fiz. Tverd. Tela (St. Petersburg) 42(10), 1780 (2000) [Phys. Solid State 42 (10), 1825 (2000)].
3. D. Dimos, P. Chaudhari, J. Mannhart, and F. K. LeGoues, Phys. Rev. Lett. 61, 219 (1988).
4. D. Dimos, P. Chaudhari, and J. Mannhart, Phys. Rev. B: Condens. Matter 41, 4038 (1990).
5. Yu. P. Denisov, Fiz. Tverd. Tela (Leningrad) 18(1), 119 (1976) [Sov. Phys. Solid State 18 (1), 66 (1976)].