%0 Journal Article %A John, Kamil %T U-ideals of factorable operators %J Czechoslovak Mathematical Journal %D 1999 %P 607-616 %V 49 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_1999__49_3_a11/ %G en %F CMJ_1999__49_3_a11