R. WYRZYKOWSKI, “Phase velocity of a pressure wave on the axis of an acoustic field of a circular ring in an acoustic baffle”, Arch. Acoust., vol. 11, no. 4, pp. 331–337, Jul. 2015, Accessed: Apr. 25, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/3128