%0 Journal Article %A P.E.T. Jorgensen %T Semigroups of measures in non-commutative analysis. %J Semigroup forum %D 1991 %P 263-290 %V 43 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/SF_1991__43_3_135115/ %F SF_1991__43_3_135115