1) M.J. Balas: Toward a More Practical Control Theory for Distributed Parameter Systems, Control and Dynamic Systems, Advance in Theory and Applications, Ed. C.T. Leondes, 18, 361/421, Academic Press (1982)
2) L. Meirovitch and H. Baruh: On the Problem of Observation Spillover in Self-Adjoint Distributed Parameter Systems, J. Optimization Theory and Application, 39-2, 269/291 (1983)
3) M.J. Balas: Finite-Dimensional Control of Distributed Parameter Systems by Galerkin Approximation of Infinite Dimensional Controllers, J. Mathematical Analysis and Application, 114, 17/36 (1986)
