%0 Journal Article %A Richard Arens %T On a theorem of Gleason, Kahane and Żelazko %J Studia Mathematica %D 1987 %P 193-196 %V 87 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4064/sm-87-2-193-196/ %R 10.4064/sm-87-2-193-196 %G pl %F 10_4064_sm_87_2_193_196