1. ASTM E399-81 (1981): Standard test method for plane strain fracture toughness in metallic materials, ASTM, New York.
2. Degiorgi, V. G., Matic, P., Baron, I., Lee, G. M. C. (1995): An experimental and computational investigation of crack growth initiation in three-point bend fracture specimens. Engng. Fract. Mech. 50, 1?9.
3. Gdoutos, E. E., Zacharopoulos, D. A. (1987): Mixed mode crack growth in plates under three point bending. Exper. Mech. 27, 365?369.
4. Hock, E., Bieniawski, Z. T. (1965): Brittle fracture propagation in rock under compression. Int. J. Fract. Mech. 1, 137?155.
5. ISRM (1988): Suggested methods for determining the fracture toughness of rocks, F. Ouchterlony (Working Group Co-Ordinator). Int. J. Rock Mech. Min. Sci. Geomech. Abstr. 25, 71?96.