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2. (2) Higo, Y., Damri, D., Nunomura, S., Kumada, K., Sawa, N., Hanaoka, K., Teranaka, T., Iwamoto, T., The fracture toughness characteristics of three dental composite resins, Biomed. Mater. Engng. 1, (1991), pp.223-231.
3. Fracture toughness of water-aged resin composite restorative materials
4. Fracture toughness of packable and conventional composite materials
5. (5) Williams, J.G., Fracture Mechanics of Polymers, Ellis Horwood Limited, Chichester, 1984.