1. Christensen RH, Fatigue crack growth affected by metal fragments wedged between opening-closing crack surfaces, Appl. Mater. Res. 2 4: 207–210, 1963
2. Elber W, Fatigue crack closure under cyclic tension, Engng Fract. Mech. 2, 37–45, 1970.
3. Dugdale, D.S., Yielding of steel sheets containing slits, J. Mechs. & Phys. Solids, 8(2):100–104, 1960.
4. Irwin, G.R., Linear fracture mechanics, fracture transition, and fracture control, Engng. Fract. Mechs., 1(2):241–257, 1968.
5. James, M.N., Some unresolved issues with fatigue crack closure – measurement, mechanism and interpretation problems. Proc. 9th Int. Conf. on Fracture, Sydney, Australia, (eds. B L Karihaloo et al), April 1997, Pergamon Press, 5: 2403–2414.