On the Performance of a Nonlinear Position-Velocity Controller to Stabilize Rotor-Active Magnetic-Bearings System. - Sabry M. El-Shourbagy; Nasser A. Saeed; Magdi Kamel; Kamal R. Raslan; Emad S. Abouel Nasr; Jan Awrejcewicz (Symmetry, 2021)