@inbookHemsel_Twiefel_2022, title=Piezoelectric Ultrasonic Power Transducers, DOI=10.1016/b978-0-12-819728-8.00047-4, booktitle=Reference Module in Materials Science and Materials Engineering, publisher=Elsevier, author=Hemsel, Tobias and Twiefel, Jens, year=2022