Boukazouha, Faiza, et al. “Influence of the Electrical Test Setup on the Voltage Gain Measurement of an Unloaded Rosen-Type Piezoelectric Transformer Vibrating in the First Three Modes”. Measurement Science Review, vol. 24, no. 4, Aug. 2024, pp. 137-44, doi:10.2478/msr-2024-0019.