1. BS 5762: 1979. Method for crack opening displacement (COD) testing. The British Standards Institution
2. ASTM E 1290-91. Standard method for crack-tip opening displacement (COD) fracture toughness measurement
3. European Structural Integrity Society, ESIS recommendation for determining the fracture resistance of ductile materials, ESIS P1-92
4. Fracture mechanics of weldments: properties and application to components;Schwalbe,1992
5. Fatigue crack propagation behavior in the hardness heterogeneous field;Mukai;Transactions of the Japan Welding Society,1983