Astrauskas, T., Ružickij, R., Naimušin, A., Bradulienė, J., Pranskevičius, M., & Januševičius, T. (2026). Effect of perforation hole shape and angle on sound absorption in perforated plastic panels. International Conference “Environmental Engineering”, 13, 1–7. https://doi.org/10.3846/enviro.2026.1448