Riduan, A., Rainiyati, R., Heraningsih, S. F., & Badariah, B. (2022). Minimizing river pollution by batik dye wastewater using palm oil fuel ash (POFA) as an environmentally friendly, low-cost adsorbent alternative. Journal of Degraded and Mining Lands Management, 10(1), 3981–3989. https://doi.org/10.15243/jdmlm.2022.101.3981