1. Analysis of feedback systems with structured uncertainties;Doyle;IEE Proc.,1982
2. Asymptotic stability of an equilibrium position of a family of systems of linear differential equations;Kharitonov;Differential'nye Uraveniya,1978
3. Stability margins of diagonally perturbed multivariable feedback systems;Safonov;IEE Proc.,1982
4. The complex structured singular value;Packard;Automatica,1993