%0 Journal Article %A Volker Wrobel %T Strictly Cosingular Operators on (DF)-Spaces. %J Mathematische Zeitschrift %D 1980 %P 281-288 %V 174 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1980__174_173013/ %F MZ_1980__174_173013