%0 Journal Article %A Béla Bollobás %T Normally subregular systems in normed algebras %J Studia Mathematica %D 1973 %P 263-266 %V 49 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-49-3-263-266/ %R 10.4064/sm-49-3-263-266 %G en %F 10_4064_sm_49_3_263_266