1. Vertical forces used during chewing of food;Howell;J Dent Res,1950
2. Measurement of stress in mastication;Anderson;J Dent Res,1956
3. Maximal contraction force and endurance of human jaw closing muscles in isometric clenching;Waltimo;Scand J Dent Res,1993
4. Fracture surface energy of glass;Wiederhorn;J Am Ceram Soc,1969
5. Fracture mechanics applied to brittle materials ASTM STP 678;Freiman,1978