Invariance of the strict Hurwitz property for polynomials with perturbed coefficients

Given a strictly Hurwitz polynomial f(??) = ??n+ an-1??n-1+an-2??n-2+...+a1??+a0, it is of interest to know how much the coefficients ai can be perturbed while simultaneously preserving the strict Hurwitz property. For systems with n ?? 4, maximal intervals of the ai are given in a recent paper by Guiver and Bose [1]. In this note, a theorem of Kharitonov is exploited to obtain a general result for polynomials of any degree.