%0 Journal Article %A T. Körner %T A Helson set of uniqueness but not of synthesis %J Colloquium Mathematicum %D 1991 %P 67-71 %V 62 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-62-1-67-71/ %R 10.4064/cm-62-1-67-71 %G en %F 10_4064_cm_62_1_67_71