K. S. Al-Hachamee, E. ., & A. A. Al-Quraishi, H. . (2010). Penetration Depth Local Effect of Impactors on Concrete Structures. Journal of Engineering and Sustainable Development, 14(1), 114-121. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1483