%0 Journal Article %A Aage Bondesen %A Arne Bronsted %T A dual proof of the upper bound conjecture for convex polytopes. %J Mathematica Scandinavica %D 1980 %P 95-102 %V 46 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1980__46_166692/ %F MS2_1980__46_166692