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3. J. Barsom and S.T. Rolfe, ASTM STP 466, 1966, cited in R.W Hertzberg, Deformation and fracture mechanics of engineering Materials, 2nd. ed., John Wiley, 1983, p 344.
4. R.W. Hertzberg, Deformation and fracture mechanics of engineering materials, John Wiley, 1983, p 281.