%0 Journal Article %A Zofia Adamowicz %T A generalization of Shoenfield theorem on $(Σ^1)_2$ sets %J Fundamenta Mathematicae %D 1984 %P 81-90 %V 123 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-123-2-81-90/ %R 10.4064/fm-123-2-81-90 %G en %F 10_4064_fm_123_2_81_90