1. Variation of constants, vector Lyapunov functions, and comparison theorem;Aftabizadeh;Applied Mathematics and Computation,1980
2. A new method for improvement of robustness bounds for linear state equations;Barmish,1986
3. Nonnegative Matrices in the Mathematical Sciences;Berman,1979
4. On the stability of large scale interconnected systems under structural perturbations;Bernussou,1978