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$B!&(B H. Fujishiro and S. Kohayashi , IEEE Trans. Appl. Supercond. 12, (2002) pp. 1124-1127.

$B!&(B H. Fujishiro, M. Ikebe, S. Kohayashi, K. Noto and K. Yokoyama$B!"(BCryogenics, 43 (2003) pp. 477-481.$B!!(B