REFERENCES
- DESOER , C. A. , and VIDYASAGAR , M. , 1975 , Feedback Systems Input-Output Properties ( New York Academic Press ).
- MORI , T. , FUKUMA , N. , and KUWAHARA , M. , 1981 , Int. J. Control , 34 , 1175 .
- MORI , T. , and KUWAHARA , M. , 1981 , Preprint of 8th IFAC World Congress , Kyoto .