1. ANSI/ASTM E399-71, A Standard Testing Method of Plane Strain Fracture Toughness of Metal Material, Annual Book of Standards, Part 31, Philadelphia, Pa (1971).
2. BS5767: 1979, Methods for Crack Opening Displacement (COD) Testing, BSI, London (1979).
3. RILEM Technical Committee 50-FMC, RILEM Draft Recommendation, Determination of the Fracture Energy of Mortar and Concrete by Means of Three-Point Bend Tests on Notched Beams, Materials and Structures 18(106) (1985) 285–290.
4. ISRM Suggested Methods for Determining the Fracture Toughness of Rock. F.Ouchterlouy, Working Group Coodiuater, International Journal of Rock Mechanics, Mineral Science and Geomechanics Abstracts 25 (1988).
5. G. Valentin, Short Presentation of Mode II Specimens, Workshop on Determination of Fracture Properties of Wood-especially in Mode II and Mixed Mode I and II, Bordeaux, France, April 07–08, 1992.