T. A. Adlie, S. Rizal, N. Ali, S. Huzni, Z. Arif, and S. Suheri, “TESTING THE FLEXURAL PROPERTIES OF POLYMER COMPOSITES FOAMING HYBRID OIL PALM EMPTY FRUIT BUNCHES (OPEFB) AND ZINC OXIDE (ZnO)”, sintek. jurnal. ilm. teknik. mesin, vol. 14, no. 2, pp. 68–73, Dec. 2020.