TY  - JOUR
AU  - Karl Gustaffson
TI  - Positive (Noncommuting) Operator Products and Semigroups.
JO  - Mathematische Zeitschrift
PY  - 1968
SP  - 160
EP  - 172
VL  - 105
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1968__105_170974/
ID  - MZ_1968__105_170974
ER  -