%0 Journal Article %A A. Goncharov %T Perfect sets of finite class without the extension property %J Studia Mathematica %D 1997 %P 161-170 %V 126 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-126-2-161-170/ %R 10.4064/sm-126-2-161-170 %G en %F 10_4064_sm_126_2_161_170