1. Control of Distributed Systems (Survey);Butkovskii;Avtom.i Telemkh.,1979
2. Low sensitivity optimal control of a class of linear distributed systems;Chin;Ing. J. Control,1972
3. Feedback Systems;Cruz,1972
4. Introduction to System Sensitivity Theory;Frank,1978
5. The Method of Weighted Residuals and Variational Principles;Finlayson,1972