Ermadani, Sarman S, Yasdi, Fuad Nurdiansyah, and Suryanto , trans. “Evaluation of the Potential of Boiler Ash from Palm Oil Millas an Alternative Material for the Improvement of Acid Coal Main Drainage”. Pakistan Journal of Analytical & Environmental Chemistry 25, no. 1 (November 16, 2024): 90–98. Accessed June 21, 2025. https://pjaec.pk/index.php/pjaec/article/view/9.