T. Krzyzynski, K. Popp, and W. Sextro, “On some regularities in dynamic response of cyclic periodic structures,” Chaos, Solitons \'26; Fractals, vol. 11, no. 10, pp. 1597–1609, 2000.

L. Panning, W. Sextro, and K. Popp, “Optimization of Interblade Friction Damper,” in International Gas Turbine \'26; Aeroengine Congress \'26; Exhibition, ASME, 2000, pp. 1–8.

W. Sextro, “The Calculation of the Forced Response of Shrouded Blades with Friction Contacts and Its Experimental Verification,” in International Gas Turbine \'26; Aeroengine Congress \'26; Exhibition, ASME, 2000, pp. 1–8.

K. Popp and W. Sextro, “Schwingungsanalyse von vorgespannten Schaufeln mit Deckplatten im Schaufelkranz,” in Forschungsvereinigung Verbrennungskraftmaschinen (FW) -lnformationstagung Turbinen, 1999, no. 504, pp. 21–38.

W. Sextro, “Experimental verification of a non-Hertzian contact model,” in International conference on computational methods in contact mechanics, 1999, pp. 181–190.

W. Sextro, “Forced Vibration of Elastic Structures with Friction Contacts,” in ASME Design Engineering Technical Conferences, 1999, no. DET/VIB-8180, pp. 1–10.

W. Sextro and K. Popp, “Ein ebenes Reibkontaktmodell zur Berechnung von Schaufelschwingungen mit Reibelementen,” Zeitschrift für angewandte Mathematik und Mechanik (ZAMM), vol. 79, pp. 311–312, 1999.

W. Sextro and K. Popp, “Schwingungsanalyse von vorgespannten Schaufeln mit Deckplatten im Schaufelkranz,” in Forschungsvereinigung Verbrennungskraftmaschinen (FW), 1999, no. 686, p. 56.

T. Hemsel, J. Krome, W. Littmann, and J. Wallaschek, “Modellierung piezoelektrischer Stapel- und Vielschichtaktoren für dynamischen Betrieb,” in Proceedings 2. Polnisch-Deutscher Workshop “Werkzeuge der Mechatronik,” 1998.

T. Hemsel and J. Wallaschek, “A piezoelectric linear vibration drive for high driving forces,” in Proceedings of VIBROENGINEERING, 1998, no. 1, pp. 7–12.

W. Sextro, K. Popp, and I. Wolter, “Vibrational Behaviour of Tuned and Detuned Bladed Disks with Friction Dampers,” in International Congress on Combustion Engines, Proceedings of the 22nd CIMAC, 1998, vol. 1, pp. 257–270.

W. Sextro, K. Popp, and I. Wolter, “Three-Dimensional Vibration of Bladed Disk Assemblies with Friction Dampers,” in The 7th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Proceedings of ISROMAC-7, 1998, vol. B, pp. 621–630.

S. Goldschmidt, T. Hemsel, J. Krome, H. Storck, and J. Wallaschek, “Schwingungsprüfstand zur vollautomatischen Messung von Ultraschallschwingungen in piezoelektrischen Antrieben,” in Tagungsband zum 4. Laser Vibrometer Seminar der Polytec GmbH, 1997.

T. Hemsel and J. Wallaschek, “Ultrasonic motors for linear positioning tasks in automobiles,” in Proceedings of the 30th International Symposium on Automotive Technology \'26; Automation (ISATA), 1997, pp. 631–637.

T. Hemsel and J. Wallaschek, “Piezoelectric ultrasonic linear motors,” in EUROMECH, European Mechanics Colloquium “Synthesis of Mechatronic Sytems,” 1997, no. 370.

K. Popp and W. Sextro, “Schwingungsverhalten von verstimmten Beschaufelungen mit Reibelementen,” in Forschungsvereinigung Verbrennungskraftmaschinen (FW) -lnformationstagung Turbinen, 1997, no. 496, pp. 131–142.

W. Sextro, “Schwingungsverhalten von Schaufelkränzen mit Reibelementen bei Frequenzverstimmung,” in VDI-Reihe, 1997, vol. 11, no. 245.

W. Sextro, K. Popp, and I. Wolter, “Improved reliability of bladed disks due to friction dampers,” in The 1997 International Gas Turbine \'26; Aeroengine Congress \'26; Exposition, 1997.

K. Popp and W. Sextro, “Schwingungsverhalten eines Schaufelkranzes mit Reibelementen bei Frequenzverstimmung,” in Forschungsvereinigung Verbrennungskraftmaschinen (FW) - lnformationstagung Turbinen, 1996, no. 490, pp. 53–76.

K. Popp and W. Sextro, “Dynamical Behaviour of a Bladed Disk with Friction Dampers,” in The 2nd European Nonlinear Oscillation Conference - Proceedings of EUROMECH, 1996, vol. 1, no. 518, pp. 157–183.