Rigobert, S., F. Sgard, and N. Atalla. “Modeling of Multilayered Structures Including Porous Materials Using Hierarchical Elements and Non Coincident Meshes”. Canadian Acoustics 28, no. 3 (September 1, 2000): 32–33. Accessed March 29, 2024. https://jcaa.caa-aca.ca/index.php/jcaa/article/view/1277.