1. O. V. Stognei, Yu. E. Kalinin, A. V. Sitnikov, I. V. Zolotukhin, and A. V. Slyusarev, Fiz. Met. Metalloved. 91(1), 24 (2001) [Phys. Met. Metallogr. 91 (1), 21 (2001)].
2. A. B. Pakhomov, X. Yan, and B. Zhao, Appl. Phys. Lett. 67, 3497 (1995).
3. B. A. Aronzon, D. Yu. Kovalev, A. E. Varfolomeev, A. A. Likal’ter, V. V. Ryl’kov, and M. V. Sedova, Fiz. Tverd. Tela (St. Petersburg) 41(6), 944 (1999) [Phys. Solid State 41 (6), 857 (1999)].
4. A. Granovsky, I. Bykov, E. Gan’shina, V. Gushchin, M. Inoue, Yu. Kalinin, A. Kozlov, and A. Yurasov, Zh. Éksp. Teor. Fiz. 123(6), 1256 (2003) [JETP 96 (6), 1104 (2003)].
5. A. Granovskiĭ, H. Sato, Y. Aoki, and A. Yurasov, Fiz. Tverd. Tela (St. Petersburg) 44(11), 2001 (2002) [Phys. Solid State 44 (11), 2095 (2002)].