Khair, Fazlin A., Azma Putra, Mohd Jailani M. Nor, and M.Z. Selamat. 2022. “Analysis of Sound Absorption of Hollow Tube Absorbers ”. International Journal of Automotive and Mechanical Engineering 13 (2):3492-3502. https://doi.org/10.15282/ijame.13.2.2016.16.0288.