Unbalance compensation using generalized notch filters in the multivariable feedback of magnetic bearings. - Raoul Herzog; Philipp Bühler; Conrad Gähler; René Larsonneur (IEEE Trans. Control. Syst. Technol., 1996)

New results for self-sensing active magnetic bearings using modulation approach. - Alexandre Schammass; Raoul Herzog; Philipp Bühler; Hannes Bleuler (IEEE Trans. Control. Syst. Technol., 2005)