Purbasari, Aprilina, Tjokorde Walmiki Samadhi, and Yazid Bindar. 2018. “Sulfuric Acid Resistance of Geopolymer Mortars from Co-Combustion Residuals of Bamboo and Kaolin”. ASEAN Journal of Chemical Engineering 18 (2), 22-30. https://dev.journal.ugm.ac.id/v3/AJChE/article/view/9021.