1. J.M. Barsom and S.T. Rolfe:Fracture and Fatigue Control in Structures, Prentice-Hall, Englewood Cliffs, NJ, 1987, p. 467.
2. British Standard Methods for Crack Opening Displacement Testing, BS-5762, 1979.
3. Standard Test for JIC, ASTM E-813-87, 1987.
4. Tentative Recommended Practice for R-Curve Determination, ASTM, Philadelphia, PA, 1978.
5. R.M. McMeeking:J. Mech. Phys. Solids, 1977, vol. 25, pp. 357–81.