1. Controllability and Observability in Multivariable Control Systems;Gilbert;J. SIAM on Control,1963
2. Mathematical Description of Linear Dynamical Systems;Kalman;J. SIAM on Control,1963
3. Irreducible Realizations and the Degree of a Rational Matrix;Kalman;J. SIAM,1965
4. On the Structural Properties of Linear, Constant, Multivariable Systems;Kalman,1966
5. Effective Construction of Linear State-Variable Models from Input/Output Data;Ho,1965