1. Guidance on methods for assessing the acceptability of flaws in fusion welded joints;British Standards Institution,1991
2. Rules for the assessment of interacting surface cracks under mode I loading;Leek;Int. J. Pres. Ves. and Piping,1994
3. Shapes and coalescence of surface fatigue cracks;Iida,1983
4. The interaction and growth of two surface cracks under fatigue loading;Leek,1990