REFERENCES
- GILBERT , E. G. , 1963 , J. SIAM Control, A , 1 , 128 .
- KALMAN , R. E. , and BERTRAM , J. E. , 1960 , J. bas. Engng , 82 , 371 .
- PORTER , B. , 1967 , Stability Criteria for Linear Dynamical Systems ( Oliver & Boyd Limited ).
- WONHAM , W. M. , 1967 , I.E.E.E. Trans. autom. Control , 12 , 660 .
- †Communicated by Professor B. Porter.