%0 Journal Article %A V. S. Rychkov %T Linear extension operators for restrictions of function spaces to irregular open sets %J Studia Mathematica %D 2000 %P 141-162 %V 140 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-140-2-141-162/ %R 10.4064/sm-140-2-141-162 %G en %F 10_4064_sm_140_2_141_162