Panpraneecharoen, Sasikarn, and Saowapa Chumanee. 2020. “Optimization of the Oil Extraction, Study the Chemical and Physical Properties of Arabica Spent Coffee Grounds”. Science & Technology Asia 25 (4), 12-19. https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/208258.