Łapka, Wojciech. “Acoustic Attenuation Performance of a Round Silencer With the Spiral Duct at the Inlet”. Archives of Acoustics 32, no. 4(S) (January 1, 2014): 247–252. Accessed April 28, 2025. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1416.