REFERENCES
- BODE , H. W. , and SHANNON , C. E. , 1950 , Proc. IRE , 38 , 417 .
- HOROWITZ , I. , 1975 , I.E.E.B. Trans, autom. Control , 20 , 454 ; 1976, Proc. In stn.select. Engrs, 64, 123 ;1979 a,Int. J. Systems Set., 10, 1025 ;1979 b, Int. J. Control, 30, 81 ;1980, Int. J. Control, 32, 749 .
- HOROWITZ , I. , SIDI , M , 1972 , Int. J. Control , 16 , 287 ; 1978 a, Ibid.,27, 361 ;1978 b, Ibid., 27, 351 .
- SMART , D. R. , 1974 , Fixed Point Theorems ( Cambridge University Press ).
- This research was supported in part by the Air Force Office of Scientific Research under Grant 76-2946D and the National Science Foundation under Grant ENG-7825848 at the University of Colorado.