Robust Stability of Multivariate Polynomials, Part 2: Polytopic Coefficient Variations. - Vladimir L. Kharitonov; Jorge A. Torres-Muñoz; M. I. Ramirez-Sosa (Multidimens. Syst. Signal Process., 1999)

Robust Stability of Multivariate Polynomials, Part 3: Frequency Domain Approach. - Vladimir L. Kharitonov; M. I. Ramirez-Sosa; Jorge A. Torres-Muñoz (Multidimens. Syst. Signal Process., 2000)