1. Harrison, J.D., M.G. Dawes, G.L. Archer, and M.S. Kamath: The COD approach and its application to welded structures, Research Report 55/1978/E; The Welding Institute, 1978.
2. BSI PD 6493: 1980, Guidance on some methods for the derivation of acceptance levels for defects in fusion welded joints, British Standards Institution, 1980.
3. Schwalbe, K.-H.: A simple estimation model for a centre cracked panel in tension, Proceedings of ICF International Symposium on Fracture Mechanics (Beijing), Science Press, Beijing, China, 1983.
4. Schwalbe, K.-H.: A simple engineering treatment of centre cracked tension panels in the regime of non-linear fracture mechanics under plane stress conditions, GKSS 84/E/38, GKSS Research Centre, Geesthacht, 1984.
5. Schwalbe, K.-H.: Some aspects of the crack tip opening displacement concept, to appear in a Special Issue on Fracture Mechanics of the Journal of the Aeronautical Society of India.