Klanner, M., Prem, M. S. and Ellermann, K. (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), p. e138999. doi: 10.24425/bpasts.2021.138999.