1. Mellinger, A.: Dielectric resonance spectroscopy: a versatile tool in the quest for better piezoelectric polymers. IEEE Trans. Dielectr. Electr. Insul. 10(5), 851–852 (2003)
2. Holland, R.: Representation of dielectric, elastic, and piezoelectric losses by complex coefficients. IEEE Trans. Sonics Ultrason. 14(1), 18–20 (1967)
3. Amador, G., García, A., César, P., Pardo, L.: Revisiting the characterization of the losses in piezoelectric materials from impedance spectroscopy at resonance. MDPI Mater. 9(72), 4–6 (2016)
4. Gachagan, A., Hayward, G., Stephen, P.K., Galbraith, W.: Characterization of air-coupled transducers. IEEE Trans. Sonics Ultrason. Ferroelectr. Freq. Control 43(4), 678–689 (1996)
5. Uzgur, E.: Multilayer ultrabroadband piezocomposite transducer: fabrication and characterization. Int. J. Appl. Ceram. Technol. 10(1), E13–E21 (2013)