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2. 2J. P. Ashford; and P. Popper . pp.173 -89 inSpecial Ceramics 4 . British Ceramic Research Association, Stoke-on-Trent, England, 1968 .
3. Strength Degradation of Brittle Surfaces: Blunt Indenters
4. 4B. R. Lawn, E. R. Fuller, and S. M. Wiederhorn , "Strength Degradation of Brittle Surfaces: Sharp Indenters ," ibid., 59 [5-6 ] 193 -97 (1976 ).
5. Indentation fracture: principles and applications