Thinh, D. Q., P. T. Dai, and N. K. Toan. “Study on Application of Technology to Prevent and Inhibit Paraffin Deposition in Low Yield Gas-Lift Wells Using the Method of Adsorption of Pour Point Depressant (PPD) Additives on the Surface of Reservoir Rocks”. Petrovietnam Journal, Vol. 8, Aug. 2014, pp. 40-44, https://pvj.vn/index.php/TCDK/article/view/587.