%0 Journal Article %A B. Sari %A Th. Schlumprecht %A N. Tomczak-Jaegermann %A V. G. Troitsky %T On norm closed ideals in $L(\ell _p,\ell _q)$ %J Studia Mathematica %D 2007 %P 239-262 %V 179 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm179-3-3/ %R 10.4064/sm179-3-3 %G en %F 10_4064_sm179_3_3