Le, N. T. T., Phuong, N. T. T., Hoa, H. T. and Ha, N. T. (2014) ‚ÄúTransportation tariff of natural gas pipeline and tariff setting methodologies and regulation‚ÄĚ, Petrovietnam Journal, 110, pp. 48-56. Available at: http://pvj.com.vn/index.php/TCDK/article/view/612 (Accessed: 25June2021).