Le, N. T. T., Phuong, N. T. T., Hoa, H. T. and Ha, N. T. (2014) “Transportation tariff of natural gas pipeline and tariff setting methodologies and regulation”, Petrovietnam Journal, 110, pp. 48-56. Available at: https://pvj.vn/index.php/TCDK/article/view/612 (Accessed: 31October2025).