Optimisation of Bioethanol Production from Oil Palm Trunk SapJolius Gimbun, Nor Shahirah Mohd Nasir, Sumaiya Zainal Abidin, Chin Kui Cheng and Maizirwan MelE3S Web Conf., 422 (2023) 01004DOI: https://doi.org/10.1051/e3sconf/202342201004