%0 Journal Article %A Gert K. Pedersen %A Richard V. Kadison %T Means and convex combinations of unitary operators. %J Mathematica Scandinavica %D 1985 %P 249-266 %V 57 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1985__57_166953/ %F MS2_1985__57_166953