1. A method for simplifying linear dynamic systems;Davison;IEEE Trans. Autom. Control,1966
2. Further reply by E.J. Davison;Davison;IEEE Trans. Autom. Control,1967
3. Further comments by M.R. Chidambara;Chidambara;IEEE Trans. Autom. Control,1967
4. Two simple techniques for the simplification of large dynamic systems;Chidambara;JACC,1969
5. Stable reduced-order models using pade-type approximations;Shamash;IEEE Trans. Autom. Control,1974