%0 Journal Article %A John N. WELCH %T Spectral Properties of a Linear Operator Connected with Solutions of Linear Differential Equations in Banach Spaces. %J Mathematische Annalen %D 1971 %P 253-256 %V 192 %I mathdoc %U http://geodesic.mathdoc.fr/item/MAN_1971__192_162173/ %F MAN_1971__192_162173