TY - JOUR AU - A. Gleason TI - A note on a theorem of Helson JO - Colloquium Mathematicum PY - 1949 SP - 5 EP - 6 VL - 2 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-2-1-5-6/ DO - 10.4064/cm-2-1-5-6 LA - en ID - 10_4064_cm_2_1_5_6 ER -