%0 Journal Article
%A B.D. Doytchinov
%A W.J. Hrusa
%A S.J. Watson
%T On perturbations of differentiate semigroups.
%J Semigroup forum
%D 1997
%P 100-111
%V 54
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1997__54_2_135510/
%F SF_1997__54_2_135510