REFERENCES
- BONGIORNO , JR. , J. J., and YOULA , D. C. , 1968 , Int. J. Control , 8 , 221 .
- DELLON , F. , and SARACHIK , P. E. , 1968 , I.E.E.E. Trans, autom Control , 13 , 491 .
- GANTMACHER , F. R. , 1960 , The Theory of Matrices , Vol. I ( New York Chelsea Publishing Co. ) .
- JAMESON , A. , 1968 , SIAMJ. appl. Math. , 16 , 1020 ; 1970, Int. J. Control, 11, 409 .
- JAMESON , A. , and Rossi , M. , 1968 , Aerodynamics Report 393–68–7 , Grumman Aerospace Corp .
- KALMAN , R. E. , 1960 a , Bol. Soc. Mat. Mexicana , 5 , 102 ; 1960 b, Trans. Am. Soc. mech. Engrs, J. bos. Engng, 82, 35 .
- KLEINMAN , D. , FORTMAN , T. , and ATHANS , M. , 1968 , I.E.E.E. Trans, autom. Control , 13 , 150 .
- KMCINDLEH , E. , and SARACHIK , P. S. , 1964 , Trans. I.E.E.E. autom. Control , 9 , 129 .
- KOSUT , R. , 1970 , J.A.C.C. Conference Proceedings .
- LEVINE , W. , and ATHANS , M. , 1969 , Proceedings of the 3rd Annual Princeton Conference on Information Sciences and Systems .
- LUENBERGER , D. G. , 1964 , I.E.E.E. Trans, milit. Electron. , 8 , 74 ; 1966, I.E.E.E. Trans. autom. Control, 11, 190 .
- ROTHSCHILD , D. , and JAMESON , A. , 1970 , Int. J. Control , 11 , 181 .
- WONHAM , W. M. , 1967 , I.E.E.E. Trans, autom. Control , 12 , 660 .
- †Communicated by the Authors.