Baris, Ozcan, Luis Ayala, and W. Watson Robert. “Numerical Modeling of Foam Drilling Hydraulics”. The Journal of Engineering Research [TJER] 4, no. 1 (December 1, 2007): 103–119. Accessed September 27, 2021. https://journals.squ.edu.om/index.php/tjer/article/view/33.