%0 Journal Article %A Olvido Delgado %T Optimal domains for kernel operators on $[0,\infty )\times [0,\infty )$ %J Studia Mathematica %D 2006 %P 131-145 %V 174 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm174-2-2/ %R 10.4064/sm174-2-2 %G en %F 10_4064_sm174_2_2