1. ISO Standard 14839-4. Mechanical vibration - Vibrations of rotating machinery equipped with active magnetic bearings - Part 4: Technical guidelines, system design (Draft), 09 2006.
2. A.R. Bartha. Dry friction induced backward whirl: theory and experiment. In Proc. 5th Internat. IFToMM Conf. on Rotor Dynamics, Darmstadt, pages 756–767, Sept. 1998.
3. H.F. Black. Interaction of a whirling rotor with a vibrating stator across a clearance annulus. J. Mech. Eng. Sci., Trans. IFToMM, 10:1–12, 1968.
4. R.M. Brach. Mechanical impact dynamics. John Wiley and Sons, 1991.
5. H. Dell, J. Engel, R. Faber, and D. Glass. Developments and tests on retainer bearings for a large active magnetic bearing. In Magnetic Bearings, Proc. First Internat. Symp. on Magnetic Bearings, Springer-Verlag, 1988. ETH Zurich.