%0 Journal Article
%A Karl Gustaffson
%T Positive (Noncommuting) Operator Products and Semigroups.
%J Mathematische Zeitschrift
%D 1968
%P 160-172
%V 105
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1968__105_170974/
%F MZ_1968__105_170974