1. A method for simplifying linear dynamic systems;Davison;IEEE Trans.,1966
2. The design of reduced order system;Marshall;Int. J. Control,1980
3. Control of large scale dynamic systems by aggregation;Aoki;IEEE Trans.,1968
4. Near optimum design of linear systems using singular perturbation method;Sannuti;IEEE Trans.,1969
5. Geometrical approach to reduction of dynamical systems;Anderson,1967