1. M. b.Thomas, R. h.Doremus, J.Jachro and R. l.Salsbury, J. Mater. Sci. 16 (1980) 891.
2. R. h.Doremus, ibid. 27 (1992) 285.
3. S. m.Wiederhorn, in ?Fracture mechanics of ceramics?, Vol. 2, edited by R. C. Bradt, D. P. H. Hasselman and F. F. Lange (Plenum Press, NY, 1974) p. 613.
4. F. j.Kummer and W. f.Jaffe, in ?Transactions of the Fourth World Biomaterials Congress, April 24?28, 1992? (Biomaterials e. V., Berlin, 1992) p. 504.
5. S.Lauf and R. f.Pabst, in ?Ceramic materials and components for engines?, edited by W. Bunk and H. Hausner (Deutsche Keram. Gesellschaft, Luebek-Travemunde, 1986) p. 961.