%0 Journal Article %A Victor Klee %A Czeslaw Olech %T Characterizations of a Class of Convex Sets. %J Mathematica Scandinavica %D 1967 %P 290-296 %V 20 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1967__20_165999/ %F MS2_1967__20_165999