PIDDUBNIAK, Olexa, and Nadia PIDDUBNIAK. 2013. “Analysis of Spectral Characteristics of Sound Waves Scattered from a Cracked Cylindrical Elastic Shell Filled With a Viscous Fluid”. Archives of Acoustics 38 (3): 335–350. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/52.