Comments, with reply, on "Robust stability of an interval plant with respect to a convex region in the complex plane" by J. Shaw and J. Jayasuriya

The commenter points out that the results of J. Shaw and J. Jayasuriya (ibid., vol.38, no.2, pp.284-287, Feb.1993) were published by F.J. Kraus and W. Truol (Int. J. Contr., vol.52, no.4, pp.967-983, 1991) for robust stability of polynomial families with affline linear parameter dependence. The authors agree with the commenter and point out that their own results derive from a paper they submitted for publication in 1990, but which has not yet been printed, which contained arguments similar to those of the commenters.<>