Sgard, F.C., and N. Atalla. “Transmission Loss through Barriers Lined With Heterogeneous Porous Materials”. Canadian Acoustics 28, no. 3 (September 1, 2000): 92–93. Accessed March 29, 2024. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1305.