1. Nonnegative Matrices in Mathematical Sciences;Berman,1979
2. Stability radii of infinite-dimensional positive systems;Fischer;Math. Control Signals Syst.,1997
3. Stability radii of Metzler operators;Fischer;Vietnam J. Math.,1998
4. Analysis and Synthesis of Time Delay Systems;Gorecki,1989
5. Real and complex stability radii: a survey;Hinrichsen,1990