E. KOZŁOWSKI and E. KOTARBIŃSKA, “Laboratory objective method for noise reduction measurements of ear-muffs”, Arch. Acoust., vol. 32, no. 2, pp. 287–292, May 2014, Accessed: Apr. 26, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/801