%0 Journal Article %A Vel, M. van de %T A Hahn-Banach Theorem in Subbase Convexity Theory %J Canadian journal of mathematics %D 1980 %P 804-820 %V 32 %N 4 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-061-x/ %R 10.4153/CJM-1980-061-x %F 10_4153_CJM_1980_061_x