1. “Polynomials and Linear Control Systems“;Barnett,1983
2. “Inners and Stability of Dynamic Systems“;Jury,1982
3. “A new stability problem for polynomials with real coefficients”, (in Italian);Faedo;Ann. Scuola Norm. Sup. Pisa Sci. Fis. Mat. Ser.,1953
4. “Asymptotic stability of an equilibrium position of a family of systems of linear differential equations”;Kharitonov;Differential'nye Uravneniya,1978
5. “On a generalization of a stability criterion”, (in Russian);Kharitonov;Izv. Akad. Nauk. Kazakh. SSR Ser. Fiz. Mat.,1978