%0 Journal Article %A R. Triggiani %T A sharp result on the exponential operator-norm decay of a family of strongly continuous semigroups. %J Semigroup forum %D 1994 %P 387-396 %V 49 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/SF_1994__49_2_135362/ %F SF_1994__49_2_135362