Sarireh, Mohmd Kh. “Minor Time Ratio in HDD Prereaming Time in Clayey Conditions – Case Study”. International Journal of Sustainable Construction Engineering and Technology 6, no. 2 (September 15, 2015): 1-15. Accessed November 27, 2020. https://publisher.uthm.edu.my/ojs/index.php/IJSCET/article/view/1078.