Zeng Feihu Zeng, Chen Xiaohua, Feng Wang, SyYi Sim, and Lu Huangteng. “Characterization and Application of Na SnO₂ Catalyst in Biodiesel Production: Insights into Structure and Performance”. International Journal of Integrated Engineering 18, no. 1 (April 15, 2026): 72–83. Accessed July 23, 2026. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/24353.