Reply to ´Counterexample and correction to a recent result on robust stability of a diamond of complex polynomials´ by H. I. Kang et al. (Nov. 1991 1370-3)

The authors show how a modification of their approach (see ibid., vol.36, p.1168-74, 1989) leads to the stability edges, correctly identified in the above-named work (see ibid., vol.38, p.1370-3, 1991) by K.I. Kang et al., for a diamond of complex polynomials. The feasibility of reduction from 32 to 16 distinguished edges is facilitated via use of Foster´s (complex) reactance theorem in network theory.<>