Ding, Lijun, Jinrui Ni, Yinan Hao, Bo Hai, and Tegen Ao. “Preparation, Characterization, and Catalytic Properties of SO42- SnO2-Hangjin2#Clay Solid Superacid Catalyst”. BioResources 18, no. 3 (July 26, 2023): 6194–6203. Accessed November 13, 2025. https://ojs.bioresources.com/index.php/BRJ/article/view/22657.