1. Balas, M.,Distributed Parameter Feedback Control with Finite-Dimensional Controllers: Recent Results, Proceedings of the International Conference on Circuits and Computers, Port Chester, New York, 1980.
2. Balas, M.,Toward a More Practical Distributed-Parameter Control Theory, Control and Dynamic Systems: Advances in Theory and Application, Vol. 18, Edited by C. T. Leondes, Academic Press, New York, New York, 1982.
3. Bongiorno, J., Jr., andYoula, D.,On Observers in Multi-Variable Control Systems, International Jouranl of Control, Vol. 8, pp. 221?243, 1968.
4. Bongiorno, J., Jr., andYoula, D.,Discussion of On Observers in Multi-Variable Control Systems, International Journal of Control, Vol. 12, pp. 183?190, 1970.
5. Curtain, R., andPritchard, A.,Functional Analysis in Modern Applied Mathematics, Academic Press, New York, New York, 1977.