Helwani, Zuchra, Said Zul Amraini, Jecky Asmura, Mohd. Roslee Othman, Samantha Peliciamanuela, and Rara Dewi Anggriani. 2024. “Eco-Friendly Approach to Palm Oil Biodiesel Production: Torrefied Palm Frond Carbon As a Source for CaO/C/NaOH Catalysts”. Leuser Journal of Environmental Studies 2 (1):12-18. https://doi.org/10.60084/ljes.v2i1.171.