%0 Journal Article %A REINHARD THRON %T Characterizations of the anti-exchange closure %J Beiträge zur Algebra und Geometrie %D 1985 %P 65-74 %V 19 %I mathdoc %U http://geodesic.mathdoc.fr/item/BAG_1985__19_138293/ %F BAG_1985__19_138293