%0 Journal Article %A Joe Howard %T On $l_1}$-singular operators %J Colloquium Mathematicum %D 1977 %P 255-258 %V 38 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-38-2-255-258/ %R 10.4064/cm-38-2-255-258 %G en %F 10_4064_cm_38_2_255_258