Nasikin, M, and A Wahid. “Effect of Ultrasonic During Preparation on Cu-Based Catalyst Performance for Hydrogenation of C02 to Methanol”. ASEAN Journal of Chemical Engineering 5, no. 2 (December 31, 2005): 111-115. Accessed November 6, 2024. https://dev.journal.ugm.ac.id/v3/AJChE/article/view/7639.