Yj. Sun et al., COMMENTS ON D-STABILITY OF CONTINUOUS TIME-DELAY SYSTEMS SUBJECTED TOA CLASS OF HIGHLY STRUCTURED PERTURBATIONS, IEEE transactions on automatic control, 43(5), 1998, pp. 689-689
In this paper, we wish to point out that the proof of the main results
in the above-mentioned paper(1) is incorrect, Furthermore, we will ve
rify that there exists no continuous time-delay system guaranteeing th
e D(alpha, r)-stability.