Bochenek, D., and P. Wawrzała. “PbFe1/2Nb1/2O3/Ceramics/As/a/Base/Material/for/Electromechanical/Transducers”. Archives of Acoustics, vol. 31, no. 4, Apr. 2014, pp. 513-9, https://acoustics3.ippt.pan.pl/index.php/aa/article/view/744.