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2. I.S. Abou-Sayed, C.W. Marschall, and M.F. Kannine,Advances in Fracture Research, Pergamon, Oxford, 227?234.
3. W.T. Chiang,Fracture 1977, University of Waterloo, 4 (1978) 135?154.
4. STP 560;R.C. Shah,1974