1. 1. BS5762: 1979. Methods for Crack Opening Displacement (COD) Testing..
2. 2. PD6493: 1980. Guidance on Some Methods for the Derivation of Acceptance Levels for Defects in Fusion Welded Joints..
3. 3. ASTM E813-81. Standard Test Method for Jlca Measure of Fracture Toughness..
4. 4. I. Milne (1986 ) Assessment of the integrity of structures containing defects. CEGB R/H/R6.