%0 Journal Article %A Zofia Adamowicz %T Continuous relations and generalized $G_δ$ sets %J Fundamenta Mathematicae %D 1984 %P 91-107 %V 123 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-123-2-91-107/ %R 10.4064/fm-123-2-91-107 %G en %F 10_4064_fm_123_2_91_107