1. Chong, T.V., Kambe, S., Ishii, O.: Physica C 468, 1214 (2008)
2. Singhal, R.K.: J. Alloys Compd 495, 1 (2010)
3. Yao, X., Oka, A., Izumi, T., Shiohara, Y.: Physica C 339, 99 (2000)
4. Saleh, A.M., Abu-Samreh, M.M., Soliman, M.H., Leghrouz, A.A., Ketaneh, R.M.-L., Darwish, S., Abu Taha, M.I.: Thin Solid Films 468, 93 (2004)
5. Oh, S.S., Ha, H.S., Kim, H.S., Ko, R.K., Song, K.J., Ha, D.W., Kim, T.H., Lee, N.J., Youm, D., Yang, J.S., Kim, H.K., Yu, K.K., Moon, S.H., Ko, K.P., Yoo, S.I.: Supercond. Sci. Technol 21, 034003 (2007)