Saewan, Nisakorn, Dr. Ampa Jimtaisong, and Wanisa Vichit. “Optimization of Phenolic Extraction from Coffee by−product Using Response Surface Methodology and Their Antioxidant Activities”. Food and Applied Bioscience Journal 8, no. 2 (June 22, 2020): 14-26. Accessed September 19, 2020. https://li01.tci-thaijo.org/index.php/fabjournal/article/view/240048.