Kopania JM, Wójciak K, Gaj P, Bogusławski G. The influence the surface of ventilation duct on sound attenuation in the airflow. Arch. Acoust. [Internet]. 2026 Mar. 31 [cited 2026 Jun. 2];. Available from: http://acoustics.ippt.gov.pl/index.php/aa/article/view/4328