Z. SUROWIAK, “The influence of Pb vacancies on the properties of PZT-type ceramic transducers”, Arch. Acoust., vol. 25, no. 2, pp. 251–269, Jan. 2000, Accessed: Jun. 21, 2025. [Online]. Available: https://acoustics.ippt.pan.pl/index.php/aa/article/view/368