Abdel-Hay Gabr, A. S. “Behavior of Steel Fiber Recycled Coarse Aggregate Reinforced Concrete Subjected to Direct Shear”. International Journal of Advanced Science and Technology, Vol. 29, no. 4s, Mar. 2020, pp. 1297 -10, http://sersc.org/journals/index.php/IJAST/article/view/6784.