1. and , Optimal Control, Linear Quadratic Methods, Prentice-Hall, Englewood Cliffs, NJ, 1989.
2. ‘A tutorial on the LQG/LTR method’, Proc. Amer. Contr. Conf., Seattle, WA, 1986, pp. 1289–1296.
3. Robust control system design with a proportional integral observer
4. and , ‘Loop transfer recovery via a proportional-integral observer’, Proc. IEEE Int. Conf. on Systems Engineering, Pittsburgh, PA, 1990, pp. 468–473.
5. Robustness with observers