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Angel, Y. C., Whitney, J. P., & Attibele, P. R. (1993). Research note on evaluation of the plastic deformation of beams under transverse impact. International Journal of Plasticity, 9(8), 921–930. doi:10.1016/0749-6419(93)90058-x 
10.1016/0749-6419(93)90058-x