Rosazley, R.; Shazana, M.; Izzati, M.; Fareezal, A.; Rushdan, I.; Ainun, Z. CHARACTERIZATION OF NANOFIBRILLATED CELLULOSE PRODUCED FROM OIL PALM EMPTY FRUIT BUNCH FIBERS (OPEFB) USING ULTRASOUND. JCIT 2016, 6, 30-37.