1. E. R. Fuller Jr and R. Thompson, ?Fracture Mechanics of Ceramics?, Vol. 4, edited by R. Bradt, D. P. H. Hasselman and F. F. Lange (Plenum, New York, 1978) p. 157.
2. S. Wiederhorn, ibid, Vol. 2, p. 613.
3. R. Oriani and P. Josephic, Acta Met. 22 (1974) 1065.
4. B. Lawn and T. Wilshaw, ?Fracture of Brittle Solids?, (Cambridge University Press, 1975).
5. H. H. Uhlig, ?Corrosion and Corrosion Control? (Interscience, New York, 1972).