Klanner, Michael, Marcel S. Prem, and Katrin Ellermann. 2021. “Quasi-Analytical Solutions for the Whirling Motion of Multi-Stepped Rotors With Arbitrarily Distributed Mass Unbalance Running in Anisotropic Linear Bearings”. Bulletin of the Polish Academy of Sciences Technical Sciences 69 (6):e138999. https://doi.org/10.24425/bpasts.2021.138999.