Anstis, G.R.; Chantikul, P.; Lawn, B.R.; and Marshall, D.B. (1981): A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: 1, Direct Crack Measurements, J Am Ceram Soc64: 533-538.
2.
Ferracane, J.L.; Antonio, R.C.; and Matsumoto, H. (1987): Variables Affecting the Fracture Toughness of Dental Composites, J Dent Res66: 1140-1145.
3.
Hashemi, S. and Williams, J.G. (1985): Crack Sharpness Effects in Fracture Testing of Polymers, J Mater Sci20: 922-928.
4.
Knott, J.F. (1973): Fundamentals of Fracture Mechanics, London : Butterworth's, pp. 137, 138.
5.
Lloyd, C.H. and Adamson, M. (1987): The Development of Fracture Toughness and Fracture Strength in Posterior Restorative Materials, Dent Mater3: 225-231.
6.
Lloyd, C.H. and Iannetta, R.V. (1982): The Fracture Toughness of Dental Composites. Part I: The Development of Strength and Fracture Toughness, J Oral Rehabil9: 55-66.
7.
Lloyd, C.H. and Mitchell, L. (1984): The Fracture Toughness of Tooth Coloured Restorative Materials, J Oral Rehabil11: 257-272.
8.
Morena, R.; Lockwood, P.E.; and Fairhurst, C.W. (1986): Fracture Toughness of Commercial Dental Porcelains , Dent Mater2: 58-62.