References

1. Doyle, J . C . B . A .Francis, and A.R.Tannenbaum, feedback Control Theory, Maxwell macmillan, New York, 1992.
2. M.S. Chen, and M. Tomizuka,"Robust output feedback control for uncertain Linear systems,"
3. M. Coless, and G. Leitmann, "Continuous state feedback guarateeing uniform ultimate boundedness for uncertain dynamic systems, "IEEE Trans, Automat. Contr., Vol. AC-26, pp.1139-1133,1981.
4. C. A. Desoer, and M.Vidyasagar, Feedback Systems : Input Properties,Academic Press, Newyork,1975
5. A. Isidori, Nonlinear Control Systems : An Introduction, springer Verlag, New york,1985
6. G. Leitmann, "On the efficiency of nonlinear control in uncertain linear systems," J. of Dyn. Sys., mea. and cont., Vol. 103, No. 2, pp.95-102,1981 https://doi.org/10.1115/1.3139661
7. T. Kailath, Linear ystem, Pretice-Hall, N. J. Englewood Cliffs, 1980