Jeenkour, P., A. . Meephua, and S. Tabtimthong. “Study on Viscosity and Acid of Lubricant-Water Contamination Using Nano-Graphite Powder and Sunflower Oil As Additives”. Engineering and Technology Horizons, vol. 39, no. 3, Sept. 2022, pp. 57-71, https://ph01.tci-thaijo.org/index.php/lej/article/view/247952.