M. Hunstig, T. Hemsel, and W. Sextro, “An efficient simulation technique for high-frequency piezoelectric inertia motors,” in Ultrasonics Symposium (IUS), 2012 IEEE International, 2012, pp. 277–280.
LibreCat: /record/9784
DOI: 10.1109/ULTSYM.2012.0068

T. Hemsel, M. Mracek, J. Wallaschek, and P. Vasiljev, “A novel approach for high power ultrasonic linear motors,” in Ultrasonics Symposium, 2004 IEEE, 2004, vol. 2, no. Vol.2, pp. 1161–1164.
LibreCat: /record/9519
DOI: 10.1109/ULTSYM.2004.1417988

T. Hemsel and J. Wallaschek, “State of the art and development trends of ultrasonic linear motors,” in Ultrasonics Symposium, 2000 IEEE, 2000, vol. 1, pp. 663–666 vol.1.
LibreCat: /record/8915
DOI: 10.1109/ULTSYM.2000.922635