Wootthikanokkhan, Sasiwimol, Sareerat Mutchika, and Artit Phontee. 2026. “REMOVAL OF FREE FATTY ACID IN CRUDE JATROPHA CURCAS OIL USING FERRIC SULPHATE FOR BIODIESEL PRODUCTION”. Suranaree Journal of Science and Technology 18 (3):229-37. https://ph04.tci-thaijo.org/index.php/SUJST/article/view/13759.