Pinisakul, A., and C. Kritayakornupong. “Heavy Metals Removal from COD Wastewater by Electromechamical Treatment Process”. Science & Technology Asia, vol. 13, no. 4, Oct. 2015, pp. 14-24, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/41415.