Title : 
What constitutes a controllable system?
         
        
        
            Author_Institution : 
Harvard University, Cambridge, MA, USA
         
        
        
        
        
            fDate : 
4/1/1962 12:00:00 AM
         
        
        
        
            Keywords : 
Communication system control; Computational modeling; Computer simulation; Control systems; Controllability; Eigenvalues and eigenfunctions; Equations; Kalman filters; Linear systems; Optimal control;
         
        
        
            Journal_Title : 
Automatic Control, IRE Transactions on
         
        
        
        
        
            DOI : 
10.1109/TAC.1962.1105460