LI, C.-M., HOU, L.-Q. and YING, C.-F. (1984) “Analysis of broad-band piezoelectric sandwich transducer with perforated structure”, Archives of Acoustics, 9(3), pp. 349–354. Available at: http://acoustics.ippt.gov.pl/index.php/aa/article/view/3230 (Accessed: 18 April 2026).