MIKULSKI, Witold. 2013. “Method of Determining the Sound Absorbing Coefficient of Materials Within the Frequency Range of 5 000–50 000 Hz in a Test Chamber of a Volume of about 2 M3”. Archives of Acoustics 38 (2): 177–183. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/30.