1. K. Durose, P. R. Edwards, and D. P. Holliday, J. Cryst. Growth 197, 733 (1999).
2. M. K. Herndon, A. Gupta, V. I. Kaydanov, and R. T. Collins, Appl. Phys. Lett. 75, 3503 (1999).
3. S. A. Muzafarova, Sh. A. Mirsagatov, and Zh. Zhanoberganov, Fiz. Tverd. Tela 49, 1111 (2007) [Phys. Solid State 49, 1168 (2007)].
4. Kh. Kh. Ismailov, A. M. Abdugafurov, Sh. A. Mirsagatov, and A. Yu. Leiderman, Fiz. Tverd. Tela 50, 1953 (2008) [Phys. Solid State 50, 2033 (2008)].
5. V. I. Stafeev, Zh. Tekh. Fiz. 28, 1631 (1958) [Sov. Tech. Phys. 3, 1502 (1958)].