Doan Tien Quyet, Cao Thi Hoai Phuong, and Nguyen Thu Ha. “The Crude Oil Market in 2019 and Outlook for 2020”. Petrovietnam Journal 10 (January 24, 2020): 49 - 57. Accessed June 19, 2026. https://tapchidaukhi.vn/index.php/TCDK/article/view/38.