Le, Nguyen Thi Thanh, Nguyen Thi Thu Phuong, Ha Thanh Hoa, and Nguyen Thu Ha. ‚ÄúTransportation Tariff of Natural Gas Pipeline and Tariff Setting Methodologies and Regulation‚ÄĚ. Petrovietnam Journal 110 (November 28, 2014): 48-56. Accessed June 25, 2021. http://pvj.com.vn/index.php/TCDK/article/view/612.