%0 Journal Article
%A Giovanni Dore
%A Alberto Venni
%T On the Closedness of the Sum of Two Closed Operators.
%J Mathematische Zeitschrift
%D 1987
%P 189-202
%V 196
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1987__196_173874/
%F MZ_1987__196_173874