G. S. Buja and M. P. Kazmierkowski, Direct Torque Control of PWM Inverter-Fed AC Motors???A Survey, IEEE Transactions on Industrial Electronics, vol.51, issue.4, pp.744-757, 2004.
DOI : 10.1109/TIE.2004.831717

C. Lascu and A. M. Trzynadlowski, A Sensorless Hybrid DTC Drive for High-Volume Low-Cost Applications, IEEE Transactions on Industrial Electronics, vol.51, issue.5, pp.1048-1055, 2004.
DOI : 10.1109/TIE.2004.834966

N. R. Idris and A. H. Yatim, An improved stator flux estimation in steady-state operation for direct torque control of induction machines, IEEE Transactions on Industry Applications, vol.38, issue.1, pp.110-116, 2002.
DOI : 10.1109/28.980364