Zainul Abidin, Muhammad Naqib, and Nurul Fitriah Nasir. 2025. “Study of Cao-TiO2 Catalyst Calcination Ratios for the Synthesis of Biodiesel”. Research Progress in Mechanical and Manufacturing Engineering 6 (1): 387-92. https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/16970.