%0 Journal Article %A R. Williamson %T A remark on a theorem of Banach %J Studia Mathematica %D 1964 %P 367-367 %V 25 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-25-3-367/ %R 10.4064/sm-25-3-367 %G de %F 10_4064_sm_25_3_367