Syed Abdul Mutalib, Sharifah Nurul Balqis, and Nurul Fitriah Nasir. “The Effects of CaO-TiO2 Calcination Temperatures on the Catalyst Characterization and Palm Biodiesel Psychochemical Properties”. Research Progress in Mechanical and Manufacturing Engineering, vol. 5, no. 2, Dec. 2024, pp. 264-7, https://publisher.uthm.edu.my/periodicals/index.php/rpmme/article/view/16812.