Rusli, M. et al. 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 (Sep. 2021), 9022–9028. DOI:https://doi.org/10.15282/ijame.18.3.2021.14.0691.