1. Controllability and Observability in Multivariable Control Systems;Gilbert;Journal SIAM, Ser. A:On Control,1963
2. Mathematical Description of Linear Dynamical Systems;Kalman;Journal SIAM, Ser. A:On Control,1963
3. On Structural Properties of Linear Constant Multivariable Systems;Kalman,1966
4. Effective Construction of Linear State-variable Models from Input/Output Functions;Ho;Regelungstechnik,1966
5. Computation of Minimal Representation of a Rational Transfer-function Matrix;Rosenbrock;Proc. IEE,1968