Synthesis of ethyl levulinate over sulfonated lignin-based carbon catalyst as a fuel additive to biodiesel-diesel blends towards engine emissions. - Hassan, Abdull Hafidz; Zainol, Muzakkir Mohammad; Samion, Muhammad Alif; Azlan, Muhammad A'qil; Asmadi, Mohd; Mohamad Daud, Ahmad Rafizan; Saad, Idris; Mohd Nor Azman, Nur Aina Najwa (Journal of Cleaner Production, 2023)