Efficiency Optimization of a 100-W, 500 000-rpm Permanent-Magnet Machine Including Air Friction Losses. - Jorma Luomi; Christof Zwyssig; Andreas Looser; Johann W. Kolar (IAS, 2007)

An Active Magnetic Damper Concept for Stabilization of Gas Bearings in High-Speed Permanent-Magnet Machines. - Andreas Looser; Johann W. Kolar (IEEE Trans. Ind. Electron., 2014)

Active Magnetic Damper for Ultrahigh-Speed Permanent-Magnet Machines With Gas Bearings. - Andreas Looser; Arda Tüysüz; Christof Zwyssig; Johann W. Kolar (IEEE Trans. Ind. Electron., 2017)