Hai Rong, and Kai Zhou. 2019. “Disturbance Rejection for a Zero-Bias Controlled Active Magnetic Bearing Based on Disturbance Observer and Notch Filter”. The Applied Computational Electromagnetics Society Journal (ACES) 34 (04):605-13. https://journals.riverpublishers.com/index.php/ACES/article/view/8541.