Awad Waryosh, W. ., Naser Al-Maliki, H. ., & Mabrok Munaa, E. . (2015). Torsional Behavior of Reinforced Concrete Hollow Core Beams. Journal of Engineering and Sustainable Development, 19(2), 72-88. https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/806