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2. 2) M. Bengisu, “Engineering Ceramics,” Springer, New York (2001).
3. 3) H. Herrmann, H. Klemm and C. Schubert, in “Handbook of Ceramic Hard Materials, edited by R. Riedel,” Wiley-VCH, Weinheim (2000).
4. Properties of Sintered Si3N4