Herianto. “Optimization Rate Of Penetration In Directional Drilling With Adjustable Bit Rotating and Hydraulic Hole Cleaning”. European Journal of Applied Sciences 9, no. 5 (November 7, 2021): 411–425. Accessed May 30, 2026. https://scholarpublishing.org/journals/index.php/EJAS/article/view/8006.