1. Singular Perturbations and Order Reduction in Control Theory - An Overview;Kokotovic,1975
2. Singular Perturbations of Linear Regulators: Basic Theorems;Kokotovic;IEEE Trans, on Automatic Control,1972
3. Singular Perturbation Methods of Asymptotic Eigenvalue Assignment in Multivariable Linear Systems;Porter;Int. J. Systems Sci,1975
4. A Method for Simplifying Linear Dynamic Systems;Davison;IEEE Trans, on Automatic Control,1966
5. Suboptimal Control of Linear Systems via Simplified Models of Chidambara;Vittal;Proc. IEE,1974