1. G. Nabiyouni, D. Ghanbari, J. Ghasemi, and A. Yousofnejad, JNS 5, 289 (2015).
2. B. Kaleji, M. Mousaei, H. Halakouie, and A. Ahmadi, JNS 5, 219 (2015).
3. M. Behpour, M. Mehrzad, and S.M. Hosseinpour-Mashkani, JNS 5, 183 (2015).
4. A. Tadjarodi, O. Akhavan, and K. Bijanzad, JNS 5, 1 (2015).
5. Q.J. Harris, Q. Feng, Y.S. Lee, R.J. Birgeneau, and A. Ito, Phys. Rev. Lett. 78, 346 (1997).