WŁODARCZYK, Edward, and Bartosz FIKUS. “Radial Vibrations of a Thick-Walled Spherical Reservoir Forced by an Internal Surge-Pressure in a Compressible Elastic Medium”. Engineering Transactions 63, no. 3 (February 25, 2015): 251–272. Accessed April 24, 2025. https://et3.ippt.pan.pl/index.php/et/article/view/73.