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\bibitem{pronto} Taylor, L. M., and Flanagan, D. P., {\em PRONTO 2D, A
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\bibitem{dyna} Hallquist, J. O., {\it User's Manual for DYNA3D and
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\bibitem{cook} Cook, R. D., {\em Concepts and Applications of Finite
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\bibitem{flanagan} Flanagan, D. P., and Belystchko, T., {\em
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\bibitem{supes} Flanagan, D. P., Mills-Curran, W. C., and Taylor, L.
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