Purnomo, Anton, Susan Gellardo, Leonila Abella, Hirofumi Hinode, and Chris Salim. 2008. “Comparison of the Catalytic Performance of Ni/CeO2/ZrO2 and Commercial Catalyst During Steam Reforming of Methane”. ASEAN Journal of Chemical Engineering 8 (1), 19-25. https://jurnal.ugm.ac.id/v3/AJChE/article/view/7695.