Ulfah, Maria, Hendra Suherman, Melia Laniwati, and Subagjo Subagjo. 2020. “Methanol Dehydration to Dimethyl Ether over Modified -Al2O3 With Acid, Base and Zeolite (NaA and NaX)”. ASEAN Journal of Chemical Engineering 20 (2), 109-19. https://journal.ugm.ac.id/v3/AJChE/article/view/9117.