1. K. Yamazaki, T. Ogawa, A. Kushibe, D. Ishihara, M. Nakano, K. Fujiwara, N. Takahashi and A. Chiba: Journal of the Magnetics Society of Japan, Vol. 23 (1999), pp.1541-1544. (in Japanese).
2. M. Oka, T. Yakushiji, Y. Tsuchida and M. Enokizono: Journal of the Magnetics Society of Japan, Vol. 25 (2001), pp.1075-1078. (in Japanese).
3. Y. Nakasone, Y. Iwasaki, T. Shimizu and S. Kasumi: Journal of Japan Society of Applied Electromagnetics and Mechanics, Vol. 9-2 (2001), pp.1-8. (in Japanese).
4. S. Takaya, T. Suzuki, T. Uchimoto and K. Miya: Journal of Japan Society of Applied Electromagnetics and Mechanics, Vol. 9-2 (2001), pp.35-43. (in Japanese).
5. A. Shimamoto, J. H. Nam and H. Inoue: The Second Japan-US Symposium on Advances in NDT, JSNDI, (1999 - 6), pp.248-253.