D. Hinrichsen et Aj. Pritchard, ROBUST STABILITY OF LINEAR EVOLUTION OPERATORS ON BANACH-SPACES, SIAM journal on control and optimization, 32(6), 1994, pp. 1503-1541
This paper introduces a stability radius for a wide class of linear in
finite-dimensional time-varying systems under structured time-varying
perturbations. A framework is presented that allows the same degree of
unboundedness in the perturbations as in the generator of the nominal
model.