Kotarbińska, E., E. Kozłowski, and R. Młyński. “Objective Tests and the Assessment of the Acoustic Properties of Ear-Plugs”. Archives of Acoustics 31, no. 4(S) (January 1, 2014): 275–280. Accessed January 17, 2026. https://acoustics.ippt.gov.pl/index.php/aa/article/view/1356.