Application of acidic ionic liquids for the treatment of acidic low grade palm oil for biodiesel production oleh Adeeb Hayyan, Andrew T.H. Yeow, Nashwan Abdullah Mohammed Alkahli, Jehad Saleh, Ahmaad Kadmouse Aldeehani, Khaled H. Alkandari, Falah DH. Alajmi, Yatimah Alias, Mohd Usman Mohd Junaidi, Mohd Ali Hashim, Wan Jefrey Basirun, Maha A.A. Abdelrahman