Hamdan NI, Zainulabidin MH, Kasron MZ, Mohd Kassim AS, Ismail AE. Effect of Perforation Size on Sound Absorption Characteristics of Membrane Absorber. ijie. 2018;10(4). Accessed July 18, 2024. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/2335