Vladimir L. KharitonovM. I. Ramirez-SosaJorge A. Torres-MuñozRobust Stability of Multivariate Polynomials, Part 3: Frequency Domain Approach.213-231200011Multidimens. Syst. Signal Process.3https://doi.org/10.1023/A%3A1008434513790db/journals/mssp/mssp11.html#KharitonovRT00