1. Hoagland, R.G., Hahn, G.T. and Rosenfield, A.R.: Influence of micro-structure on fracture propagation in rock, Rock Mechanics 5 (1973), 77–106.
2. Friedman, M., Handin, J. and Alani, G.: Fracture surface energy of rocks, Int. J. Rock Mechanics and Mining Science 9 (1972), 757–766.
3. Ritchie, R.O.: Mechanisms of fatigue crack growth in metals, ceramics and composites: role of crack tip shielding, Material Science Engineering A A103 (1988), 15–28.
4. Ritchie, R.O. and Venkateswara Rao, K.T.: Cyclic fatigue crack growth in toughened ceramics and intermetallics at ambient to elevated temperatures, Proc. ECF11, J. Petit (ed.), EMAS, Warley U.K. (1996), pp. 53–69.
5. Evans, A.G.: Perspective on the development of high-toughness ceramics, J. American Ceramic Society 73 (1990), 187–206.