M. DUKAT and A. ZARYCKA, “A Microstructure, Piezoelectric and Dielectric Properties of the PZT Ceramics Obtained by the Sol-Gel Method”, Arch. Acoust., vol. 33, no. 4(S), pp. 39–44, Dec. 2008, Accessed: Apr. 26, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/833