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2. 3H. Knock, R. Lencht, G. Ziegler, and G. Petzow ; pp.255 -64 inMetallography and Ceramography - Progress in Preparation Techniques . Riederer Veda, Stuttgart, FRG, 1978 .
3. Relation Between Strength, Fracture Energy, and Microstructure of Hot-Pressed Si3N4
4. 5D. Jack ; private communication.