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$B!&(B $B!H(BSimultaneous Measurement of Thermal Diffusivity and Conductivity Applied to Bi-2223 Ceramic Superconductors$B!I(B, M. Ikebe, H. Fujishiro, T. Naito and K. Noto, J. Phys. Soc. Jpn. 63 (1994) pp.3107-3114.