1. 1 BS 7448-Part 1. (1991) Fracture Mechanics Toughness Test. Part 1: Method for Determination of KIC, Critical CTOD and Critical J Values of Metallic Materials. British Standards.
2. 2 BS 7448-Part 4. (1997) Fracture Mechanics Toughness Test. Part 4: Method for Determination of Fracture Resistance Curves and Initiation Values for Stable Crack Extension in Metallic Materials. British Standards.