1. Canonical forms for linear multi-variable systems;Luenberger;IEEE Trans. Short Papers,1967
2. Some Properties of the Control Systems With Irreducible Matrix-Transfer Functions;Popov,1969
3. Canonical minimal realization of a matrix of impulse response sequences;Ackermann;Inform. Control,1971
4. Über die Anzahl der Parameter von Mehrgrössen-systemen;Bucy;Regelungstechnik,1970
5. A canonical model for identification of multivariable linear systems;Mayne;IEEE Trans. AC,1972