Syakira Jamil, Aina, Norinah Abd Rahman, and Roszilah Hamid. “Air-Coupled Impact Echo Test With Acoustic Shield”. International Journal of Engineering and Technology 8, no. 1.2 (January 30, 2019): 136–141. Accessed August 17, 2025. https://mail.sciencepubco.com/index.php/IJET/article/view/24885.