PIDDUBNIAK, O. “Total Scattering Cross-Section of a Nondeformable Sphere Partially Insonified at a Circular Annular Spot”. Archives of Acoustics 22, no. 3 (January 1, 2014): 297–306. Accessed April 28, 2025. https://acoustics3.ippt.pan.pl/index.php/aa/article/view/956.