SZEMELA, Krzysztof, et al. “Acoustic Power Radiated by a System of Two Vibrating Circular Membranes Located at the Boundary of Three-Wall Corner Spatial Region”. Archives of Acoustics, vol. 37, no. 4, Oct. 2013, pp. 463–473, https://acoustics3.ippt.pan.pl/index.php/aa/article/view/75.