“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), vol. 1, no. 1, pp. 29–37, Feb. 2025, Accessed: Sep. 08, 2025. [Online]. Available: https://e-journal.scholar-publishing.org/index.php/ijsat/article/view/47