Madmanang, R., S. Maprasit, N. Thongmak, P. Pradabphetrat, S. Sathawong, and R. Boonkaew. “PRODUCTION OF FLY ASH FILTER FOR IRON REMOVAL IN GROUNDWATER”. Srinakharinwirot University Journal of Sciences and Technology, vol. 15, no. 29, January-June, June 2023, pp. 1-9, Article 249771, https://ph02.tci-thaijo.org/index.php/swujournal/article/view/249771.