Hossain, Nazia, and Rafidah Jalil. “Sugar and Bioethanol Production from Oil Palm Trunk (OPT)”. Asia Pacific Journal of Energy and Environment 4, no. 1 (June 30, 2017): 13–16. Accessed May 19, 2024. https://i-proclaim.my/journals/index.php/apjee/article/view/237.