A. M. A. Abdullah, F., M. A. A. Al-Atalla, and Z. I. M. Abdullah. “Relation Between Ultrasonic Pulse Velocity and Some Mechanical Properties of Clayey Soil Treated With Lime”. Al-Rafidain Engineering Journal (AREJ), vol. 19, no. 1, Feb. 2011, pp. 15-25, doi:10.33899/rengj.2011.27807.