Jazie, Ali A. “DBSA-Catalyzed Sewage Sludge Conversion into Biodiesel in a CSTR: RSM Optimization and RTD Study”. Journal of Engineering and Technological Sciences 51, no. 4 (August 31, 2019): 537-555. Accessed October 4, 2025. https://journals.itb.ac.id/index.php/jets/article/view/7663.