“Optimization of Aceh Low-Rank Coal Upgrading Process With Combination of Heating Media to Reduce Water Content through Response Surface Method”. International Journal of Science & Advanced Technology (IJSAT) 1, no. 1 (February 26, 2025): 29–37. Accessed September 8, 2025. https://e-journal.scholar-publishing.org/index.php/ijsat/article/view/47.