KAMISIŃSKI, Tadeusz, Krzysztof BRAWATA, Adam PILCH, Jarosław RUBACHA, and Marcin ZASTAWNIK. 2013. “Sound Diffusers With Fabric Covering”. Archives of Acoustics 37 (3): 317–322. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/96.