L. FILIPCZYŃSKI and T. KUJAWSKA, “Acoustical shadow of a sphere immersed in water. II”, Arch. Acoust., vol. 14, no. 3-4, pp. 181–190, Dec. 1989, Accessed: Mar. 04, 2026. [Online]. Available: https://acoustics.ippt.gov.pl/index.php/aa/article/view/3047