1. Fracture Toughness, Part II, ASTM-STP-514;Begley,1972
2. Methods for Plane Strain Fracture Toughness (KIC) Testing, DD3;British Standards Institution,1971
3. Practical Application of Fracture Mechanics to Pressure-Vessel Technology;Burdekin,1971
4. Iron and Steel Institute;Cottrell;Spec. Rep. No. 69,1961