Bạn down giúp mình với nha:
1.PI observer design for linear time-delay systems
http://ieeexplore.ieee.org/xpl/freea...number=4699016
2.PI-observer-based reconstruction of effect-variables and construction of characteristic curves
http://ieeexplore.ieee.org/xpl/freea...number=1426772
3.Design of Generalized PI Observers for Descriptor Linear Systems
http://ieeexplore.ieee.org/xpl/freea...number=4026704
Cám ơn bạn rất nhiều!