Purbasari, Aprilina, Tjokorde Walmiki Samadhi, and Yazid Bindar. 2018. “ulfuric cid esistance of eopolymer ortars from o-ombustion esiduals of amboo and aolin”. SEAN ournal of hemical ngineering 18 (2), 22-30. https://journal.ugm.ac.id/v3/AJChE/article/view/9021.