Zeng Feihu Zeng, Chen Xiaohua, Feng Wang, SyYi Sim, and Lu Huangteng. 2026. “Characterization and Application of Na SnO₂ Catalyst in Biodiesel Production: Insights into Structure and Performance”. International Journal of Integrated Engineering 18 (1): 72-83. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/24353.