Tawfik, Mauwafak Ali, Wafa Abd Soud, and Rami Safaa Alwan. 2014. “The Effect of Soil Content, Drilling Parameters and Drilling Tool Diameter on the Vibration Assessment in the Drilling Rig”. Al-Khwarizmi Engineering Journal 11 (1): 93-112. https://www.alkej.uobaghdad.edu.iq/index.php/alkej/article/view/218.