1[1]Anderson B D O, Vangpanitlerd S. Network Analysis and Synthesis: A Modern Systems Theory Approach[M]. NJ:Prentice-Hall, 1973.
2[2]Vidyasagar M. Nonlinear Systems Analysis [M]. NJ:Prentice-Hall, 1993.
3[3]Hadad W M, Bernstein D S. Explicit construction of quadratic Lyapnov functions for the small gain,positive, circle and Popov theorems and their application to robust stability [A]. Proc of the 30thconf on Decision and Control [C]. Brighton, 1991.2618-2623.
4[4]Rolf Johansson, Anders Robertsson. Observer-based strict positive real feedback co ntrol system design[J].Automatica, 2002,38,1557-1564.
5[5]Sun W, Khargoneker P P, Shim D. Solution to the positive real control problem for linear tine-invariant systems [J]. IEEE Troms on Automatic Control, 1994,39(10): 2034-2046.
6[6]Molander P, Willems J C. Synthesis of state feedback ontrol laws with a specified gain and phase margin[J].IEEE Trans on Automatic Control, 1980,25: 928-931.
7[7]Xie L, Soh Y C. Positive real control problem for uncertain linear time-invariant systems [J]. Systems Control Letter, 1995,24: 265-271.
8[8]Xie L, Soh Y C. Robust control of linear system with generalized positive real uncertainty [J]. Automatica,1997,33(5): 963-967.
9[9]Shim D. Equivalence between positive real and normbounded uncertainty [J]. IEEE Trans on Automatic Control,1996, 41(8) :1190-1193.
10Hadad W M, Bemstein D S. Robust stabilization with positive real uncertainty: beyond the small gain theorem [ J].Systems Control Lett, 1991, 17:191 - 208.
