Somnuk, K., Theppaya, T., Smithmaitrie , P., & Prateepchaikul, G. (2015). Optimization of High Free Fatty Acid Reduction in Mixed Crude Palm Oil Using Ultrasound: A Response Surface Methodology Approach. Agriculture and Natural Resources, 49(4), 651–662. retrieved from https://li01.tci-thaijo.org/index.php/anres/article/view/243722