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3. 3) M. Rühle, M. Backhaus-Ricout, K. Burger and W. Mader: Ceramic Microstructure, Ed. by J. A. Pask and A. G. Evans, Plenum Press, New York, (1986).
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5. 5) M. Kohyama, S. Kose, M. Kinoshita and R. Yamamoto: Collected Abstracts of the 1989 Autumn Meeting of Japan Inst. Metals, p. 98.