1. Bearing pressures and cracks;Westergaard;Trans. ASME, J. Appl. Mech.,1939
2. The Calculation of Stress Intensity Factors in Two and Three Dimensions using Finite Elements;Hellen,1975
3. Calculation of stress intensity factors at crack tips using special finite elements;Blackburn,1972
4. Crack tip finite elements are unnecessary;Henshall;Int. J. Num. Meths Engng,1975
5. On the method of virtual crack extensions;Hellen;Int. J. Num. Meths Engng,1975