Bio-oil production from pyrolysis of oil palm biomass and the upgrading technologies: A review - Terry, Liza Merry; Li, Claudia; Chew, Jiuan Jing; Aqsha, Aqsha; How, Bing Shen; Loy, Adrian Chun Minh; Chin, Bridgid; Khaerudini, Deni Shidqi; Hameed, Nishar; Guan, Guoqing; Sunarso, Jaka (2021)