[1] N. E. Barabanov, Stability of differential inclusions,
Differential Equations 26(10) (1990), 1817-1818 (in Russian).
[2] F. Colonius and W. Kliemann, Stability Radii and Lyapunov
Exponents; in: D. Hinrichsen and B. Martensson (Eds.), Birkhauser,
Control of Uncertain Systems (1990), 19-55.
[3] F. Colonius and W. Kliemann, Minimal and maximal Lyapunov
exponents of bilinear control systems, J. Differ. Equations 101(2)
(1993), 232-275.
[4] A. G. Farhan and H. M. González, Radio de estabilidad real para
perturbaciones estructuradas dependientes del tiempo, Ciencias
Matemáticas 15(2-3) (1994), 197-212.
[5] H. M. González and R. S. Urquiza, Sobre el radio de estabilidad
real de sistemas bidimensionales de ecuaciones difenciales, Ciencias
Matemáticas 17(2) (1999), 82-96.
[6] D. Hinrichsen and A. J. Pritchard, Stability radii of linear
systems, Systems & Control Letters 7 (1986), 1-10.
[7] D. Hinrichsen and A. J. Pritchard, Stability radius for structured
perturbations and the algebraic Riccati equation, Systems & Control
Letters 8 (1986), 105-113.
[8] L. Qiu, B. Bernhardsson, A. Rantzer, E. J. Davison, P. M. Young
and J. C. Doyle, A formula for computation of the real structured
stability radius, Automatica 31 (1995), 879-890.
[9] R. S. Urquiza and H. M. González, Radio de estabilidad real de
sistemas bidimensionales para perturbaciones lineales dependientes del
tiempo, Extracta Mathematicae 15(3) (2000), 531-545.
[10] R. S. Urquiza and H. M. González, On the distance of a stable
matrix to the set of unstable matrices, Ciencias Matemáticas 18(1)
(2000), 20-32.