1. Canonical forms for multivariable systems;Bucy;IEEE Trans,1968
2. Effective construction of linear state-variable models from input/output functions;Ho;Regelungstechnik,1966
3. Mathematical description of linear dynamical systems;Kalman;J. SIAM Control,1963
4. Über die Anzahl der Parameter von MehrgrÖβensystemen;Bucy;Regelungstechnik,1970
5. Representation and Realization of Time-Variable Linear Systems;Silverman,1966