1. Briz, F. and Degner, M.W., Rotor position estimation, IEEE Industr. Electron. Mag., 2011, vol. 5, no. 2.
2. Holtz, J., Sensorless control of induction machines–with or without signal injection, IEEE Trans. Ind. Electron. Control Instrum., 2006, vol. 53, no. 2.
3. Jansen, P.L. and Lorenz, R.D., Transducerless position and velocity estimation in induction and salient A C machines, Proc. Industry Applications Society Annu. Meeting, Denver, 1994.