%0 Journal Article %A Freire, Nuno C. %T On the exponential of a bounded linear operator in a L(E,E) algebra %J Portugaliae mathematica %D 1991 %P 363-382 %V 48 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1991__48_4_115763/ %G en %F PORMA_1991__48_4_115763