1. BS 5762, Crack Opening Displacement (COD),1979
2. ASTM Designation: E1290 — Standard Test Method for Crack Tip Opening Displacement Fracture Toughness Measurement,1989
3. On the relation of COD to the J-integral;Hollstein;INt. J. Fracture,1977
4. Inter-relation of crack opening displacement with stress intensity factor and J-integral;Paranjpe,1976
5. On the calculation of COD form the clip gage displacement in CT and bend specimen;Kolednik;Eng. Frac. Mech.,1988