Anh, Nguyen Tuan, Ta Quang Minh, and Nguyen Thi Thu Hien. 2016. “Preparation of Micro-Bubble (Aphron) Drilling Fluid Used in Low Pressure Reservoirs”. Petrovietnam Journal 1 (January), 28-39. https://pvj.vn/index.php/TCDK/article/view/469.