A method for treating oil palm biomass by Hassan, Mohd Ali, Samsu Baharuddin, Azhari, Lim, Siong Hock, Sulaiman, Alawi, Mohd Yusoff, Mohd Zulkhairi, Kamal Bharin, Ezyana, Mokhtar, Mohd Noriznan, Nishida, Haruo, Shirai, Yoshihito, Wakisaka, Minato