1. ASTM E 1820. Standard test method for measurement of fracture toughness. Annual book of ASTM standards, vol.03.01. West Conshohocken (USA): American Society for Testing and Materials; 2009.
2. ISO 12135. Metallic materials – unified method of test for the determination of quasistatic fracture toughness. Geneva (Switzerland): International Organization for Standardization; 2002.
3. BS 7448-1. Fracture mechanics toughness tests – part 1: method for determination of KIc, critical CTOD and critical J values of metallic material. UK: BSI standards, British Standards Institution; 1991.
4. The scatter in KIc-results;Wallin;Engng Fract Mech,1984
5. A local criterion for cleavage fracture of a nuclear pressure vessel steel;Beremin;Metall Trans A,1983