1. Discrete-time sliding modes observers for induction motors;Caminhas,1996
2. General-structured unknown input observers;Chang,1994
3. Kalman filtering with unknown inputs via optimal state estimation of singular systems;Darouach;Int J Syst Sci,1995
4. On discrete-time sliding modes;Drakunov,1989
5. Sliding mode observers. Tutorial;Drakunov,1995