Sottisopha, Wattanasit, and Suwimol Asavapisit. 2015. “Immobilization of the Plating Sludge by Activation of Pulverized Fuel Ash With Sodium Silicate Solution”. Science & Technology Asia 10 (4):7-15. https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/41564.