Robustness analysis with correlated highly structured complex uncertainties

It is shown that the results reported by the author (ibid., vol.35, no.3, pp.350-352, Mar. 1990) on robustness analysis with highly structured independent perturbations is directly extendable to the case of correlated perturbations. A direct consequence of this extension is that the phase-sensitive structured singular value and the multiloop phase margin can be computed exactly