%0 Journal Article %A Lutz Weis %T On the surjective (injective) envelope of strictly (co-) singular operators %J Studia Mathematica %D 1975 %P 285-290 %V 54 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-54-3-285-290/ %R 10.4064/sm-54-3-285-290 %G en %F 10_4064_sm_54_3_285_290