“Characterization and Performance Test of Sulfonated Activated Carbon As a Catalyst in the Levulinic Acid Production Process from Cellulose”. Malaysian Journal of Catalysis 8, no. 2 (December 31, 2024): 50–57. Accessed July 19, 2026. https://mjcat.utm.my/index.php/MalJCat/article/view/188.