1. John A. Burns and Belinda B. King. A note on the regularity of solutions of infinite dimensional Riccati equations, ICASE Report 94–20, ICASE, Hampton, VA, 1994.
2. IEEE Transactions on Automatic Control;K Glover,1986
3. Ruth F. Curtain. Spectral systems, International Journal of Control, 39(4):657–666, 1984.
4. B. Davies. Integral Transforms and their Applications, Springer-Verlag, New York, 1985.
5. A. El Jai and A. J. Pritchard. Sensors and actuators in distributed systems, International Journal of Control, 46(4):1139–1153, 1987.