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Monica CP, Anggraeni VPC, Sumada K, Sari NK, Pujiastuti C. Optimization of Acetone Concentration and Reflux Ratio for Enhanced Oil Extraction from Spent Bleaching Earth: A Response Surface Methodology Approach. indones. j. env. man. sus. [Internet]. 2025Dec.10 [cited 2026May26];9(4):183-91. Available from: https://www.ijoems.com/index.php/ijems/article/view/452