Ha, D. T. H., Linh, H. and Tuyen, L. V. (2013) “Synthesis of pour point depressant additives for production and transportation of high-paraffin Bach Ho crude oil based on ester of poly-triethanolamine”, Petrovietnam Journal, 50, pp. 26-35. Available at: https://www.pvj.vn/index.php/TCDK/article/view/662 (Accessed: 17April2026).