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 April 7, 2026. https://penerbit.uthm.edu.my/ojs/index.php/ijie/article/view/2335