Friesen O, Pasha MA, Schwengelbeck M, Claes L, Baumhögger E, Henning B. Untersuchung piezoelektrischer Materialeigenschaften unter hydrostatischer Last. In: Fortschritte der Akustik - DAGA 2024. ; 2024:1117–1120.

Koch K, Friesen O, Claes L. Randomised Material Parameter Impedance Dataset of Piezoelectric Rings. zenodo; 2024. doi:10.5281/ZENODO.11207806

Zeipert H, von Germeten C, Friesen O, Claes L, Johannesmann S, Henning B. Investigation of change in dispersive behaviour during adhesive curing in multi-layered structures. In: Fortschritte Der Akustik - DAGA 2023. ; 2023:819-822.

Scheidemann C, Hemsel T, Friesen O, Claes L, Sextro W. Influence of Temperature and Pre-Stress on the Piezoelectric Material Behavior of Ring-Shaped Ceramics. In: ; 2023.

Scheidemann C, Hemsel T, Friesen O, Claes L, Sextro W. Influence of Temperature and Pre-Stress on the Piezoelectric Material Behavior of Ring-Shaped Ceramics. In: ; 2023.

Friesen O, Claes L, Feldmann N, Henning B. Estimation of Piezoelectric Material Parameters of Ring-Shaped Specimens.; 2022.