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M.A. Iqbal; G. Gupta; N.K. Gupta. (2010). 3D numerical simulations of ductile targets subjected to oblique impact by sharp nosed projectiles. , 47(2), 224–237. doi:10.1016/j.ijsolstr.2009.09.032 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research