Thuwakham, N., S. Taweekasemsombut, and S. Kathongthung. “The Quantity of Heavy Metals in Wastewater from Wire Electrical Discharge Machining”. KKU Science Journal, vol. 51, no. 1, May 2023, pp. 57-68, https://ph01.tci-thaijo.org/index.php/KKUSciJ/article/view/251673.