Bs. Bollepalli et Lr. Pujara, ON THE STABILITY OF A SEGMENT OF POLYNOMIALS, IEEE transactions on circuits and systems. 1, Fundamental theory andapplications, 41(12), 1994, pp. 898-901
Given two stable polynomials of the same degree, we derive a set of ne
cessary and sufficient conditions, in the frequency domain, under whic
h the line segment joining the two given polynomials is stable.