P. Hassan, أ.م., A. R. Yousif, أ.م.علي, D. Omar Qarani Aziz, and أ.م.د.عمر, “EFFECT OF RE-VIBRATION TIME AND STEEL FIBER CONTENT ON THE PROPERTIES OF CRUSHED CEMENT-SAND MORTAR CONCRETE Dr”., AREJ, vol. 13, no. 2, pp. 1–12, Jun. 2005.