[1]
Z. ENGEL, “K.U. INGARD, Notes on Sound Absorption Technology, Noise Control Foundation, Poughkeepsie”, Arch. Acoust., vol. 21, no. 1, pp. 115–117, Jan. 2014, Accessed: Jun. 16, 2025. [Online]. Available: https://acoustics.ippt.pan.pl/index.php/aa/article/view/984