R. Zachariasz and J. Ilczuk, “Electric and mechanical properties of Pb(Fe$_{0.5}$Nb$_{0.5}$)O$_{3}$ ferroelectric ceramics”, Arch. Acoust., vol. 32, no. 4(S), pp. 111–116, Jan. 2014, Accessed: Apr. 28, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1397