Application of Kharitonov´s theorem to robustly increase the degree of Hurwitz polynomials

A method of determining the exact coefficient bound, when a polynomial is extended by a single degree, is given. However, this method is unsuitable when additional coefficients with robust bounds are sought. To overcome this, an alternative approach, relying on Kharitonov´s theorem, is used as the basis of an algorithm for determining robust bounds on unknown coefficients in Hurwitz polynomials extended to higher degree. A description of the algorithm implementation and some encouraging results are provided