The Hadamard Product of Two Stable Multivariate Polynomials is not Necessarily Stable. - Eduardo Rodríguez Ángeles; Vladimir L. Kharitonov; Jorge A. Torres-Muñoz (Multidimens. Syst. Signal Process., 2004)

On Schur stable multivariate polynomials. - Jorge A. Torres-Muñoz; Eduardo Rodríguez Ángeles; Vladimir L. Kharitonov (IEEE Trans. Circuits Syst. I Regul. Pap., 2006)