1. Elements of Finite-dimensional Systems and Control Theory;Ahmed;Pitman SPAM, Longman Sci. Tech. Publ.,1990
2. Bensoussan, A., Prato, G. D., Delfour, M. C. and Miter, S. K., Representation and Control of Infinite-Dimensional Systems (Vol. I,II), Birkhauser, 1992
3. Linear Matrix Inequalities in Systems and Control Theory;Boyd;SIAM Studies in Appl. Math., SIAM PA,1994
4. The Riccati Equations;Bittanti,1991
5. Conti R.., Infinite-dimensional linear controllability, Math. Reports, Universuty of Minnesota, USA, 10(1982), 82-127