T. Hemsel and J. Twiefel, “Piezoelectric Ultrasonic Power Transducers,” in Reference Module in Materials Science and Materials Engineering, Elsevier, 2022.

B. Fu, C. Li, J. Zhang, Z. Huang, and T. Hemsel, “Modeling of Piezoelectric Langevin Transducers by Using Mixed Transfer Matrix Methods,” Journal of Korean Physical Society, vol. 57, no. 4, p. 929, 2010.

T. Hemsel, E. G. Lierk, W. Littmann, and T. Morita, “Various Aspects of the Placement of a Piezoelectric Material in Composite Actuators, Motors, and Transducers,” Journal of Korean Physical Society, vol. 57, no. 4, pp. 933–937, 2010.

F. Bo, L. Ting, and T. Hemsel, “A simple pre-stress estimating method of langevin transducers,” in Piezoelectricity, Acoustic Waves, and Device Applications, 2008. SPAWDA 2008. Symposium on, 2008, pp. 324–327.