P. Rakus, J. Jędryka, P. Czaja, and K. Osińska, “The influence of preparation methods and doping on the electric-field-induced piezoelectric properties of potassium bismuth titanate (K₀.₅Bi₀.₅TiO₃)”, Bull. Pol. Acad. Sci. Tech. Sci., vol. 74, no. 3, p. e157566, Apr. 2026.