%0 Journal Article %A John J. Benedetto %T A Support Preserving Hahn-Banach Property to Determine Helson-S Sets. %J Inventiones mathematicae %D 1972 %P 214-228 %V 16 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM_1972__16_142144/ %F IM_1972__16_142144