1. Suggested methods for determining the fracture toughness of rock;ISRM (F. Ouchterlony—Co-ordinator);Int. J. Rock Mech. Min. Sci. & Geomech. Abstr.,1988
2. A new core specimen for the fracture toughness testing of rock;Ouchterlony,1980
3. A simplified method for measuring plane strain fracture toughness;Barker;Engng Fract. Mech.,1977
4. Chevron-Notched Specimens: Testing and Stress Analysis,1984
5. Rock Characterization Testing and Monitoring (ISRM Suggested Methods);ISRM,1981