%0 Journal Article %A D. Bierlein %A W.J.A. Stich %T On the Extremality of measure extensions. %J Manuscripta mathematica %D 1989 %P 89-98 %V 63 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/MM2_1989__63_3_155370/ %F MM2_1989__63_3_155370