1. Parameter space design of robust control systems;Ackermann;IEEE Trans. Aut. Control,1980
2. On extreme point results for time-delay systems;Ackermann,1990
3. On robust Hurwitz polynomials;Anderson;IEEE Trans. on Aut. Control,1987
4. Invariance of the strict Hurwitz property for polynomials with perturbed coefficients;Barmish,1983