Limaye, B.V.; Nair, M.T.
(Journal of the Australian Mathematical Society (Series A). 49(1); 1990; 138-148.)
Let lambda(0) be a semisimple eigenvalue of an operator T(0). Let gamma(0) be a circle with centre lambda s(0) containing no other spectral value of T(0). Some lower bounds are obtained for the convergence radius of the ...