Jeenkour, Puttha, Aphatsara Meephua, and Satris Tabtimthong. 2022. “Study on Viscosity and Acid of Lubricant-Water Contamination Using Nano-Graphite Powder and Sunflower Oil As Additives”. Engineering and Technology Horizons 39 (3):57-71. https://ph01.tci-thaijo.org/index.php/lej/article/view/247952.