%0 Journal Article %A Guillermo P. Curbera %A Werner J. Ricker %T Optimal domains for the kernel operator associated with Sobolev's inequality %J Studia Mathematica %D 2003 %P 131-152 %V 158 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm158-2-3/ %R 10.4064/sm158-2-3 %G en %F 10_4064_sm158_2_3