1. A. G. KING and W. M. WHEILDON, ?Ceramics in Machining Process? (Academic, New York and London, 1966).
2. N. CLAUSSEN,J. Amer. Ceram. Soc. 59 (1976) 49.
3. U. DWORAK and H. OLAPINSKI,Ger. Offen. 2 923 213 (1980).
4. N. CLAUSSEN and M. RÜHLE, ?Advances in Ceramics? Vol. 3, edited by A. H. Heuer and L. W. Hobbs (1981) p. 137.
5. R. C. GARVIE, R. H. J. HANNINK and C. URBANI,Ceramurg. Int. 6 (1980) 19.