Leong, S. T., and P. Laortanakul. “An Environmentally Optimized Solidification/Stabilization for Disposal of Heavy Metal Sludge Wastes”. Science & Technology Asia, vol. 7, no. 3, Nov. 2015, pp. 22-39, https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/41787.