B. SZUDROWICZ and A. IŻEWSKA, “Influence of the external wall on the airborne sound insulation in buildings”, Arch. Acoust., vol. 21, no. 3, pp. 299–309, Jan. 2014, Accessed: Apr. 25, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/999