J. Kotus and B. Kostek, “Investigation of noise threats and their impact on hearing in selected schools – a pilot study”, Arch. Acoust., vol. 31, no. 4(S), pp. 417–424, Jan. 2014, Accessed: Jun. 10, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1376