W. ŁAPKA and C. CEMPEL, “Computational and Experimental Investigations of a Sound Pressure Level Distribution at the Outlet of the Spiral Duct”, Arch. Acoust., vol. 33, no. 4(S), pp. 65–70, Dec. 2008, Accessed: Jan. 17, 2026. [Online]. Available: https://acoustics.ippt.gov.pl/index.php/aa/article/view/837