Rusli, M., Nanda, R., Dahlan, H., Bur, M., & Okuma, M. (2021). Sound Absorption Characteristics of Composite Panel Made from Coconut Coir and Oil Palm Empty Fruit Bunches Fibre with Polyester. International Journal of Automotive and Mechanical Engineering, 18(3), 9022–9028. https://doi.org/10.15282/ijame.18.3.2021.14.0691