@article{almeida_barbosa_vergara_lenzi_2026,  title={Sound transmission, band structure and negative bulk modulus in a mirror-symmetry metamaterial},  volume={48},  ISSN={1806-1117},  url={https://doi.org/10.1590/1806-9126-RBEF-2025-0452},  DOI={10.1590/1806-9126-RBEF-2025-0452},  journal={Revista Brasileira de Ensino de Física},  publisher={Sociedade Brasileira de Física - SBF},  author={Almeida, G. do N. and Barbosa, L.R. and Vergara, E.F. and Lenzi, A.},  year={2026},  pages={e20250452} }