%0 Journal Article
%A Ronald Jensen
%A Håvard Johnsbråten
%T A new construction of non-constructible ${Δ^1}_3$ subset of ω
%J Fundamenta Mathematicae
%D 1973
%P 279-290
%V 81
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-81-4-279-290/
%R 10.4064/fm-81-4-279-290
%G en
%F 10_4064_fm_81_4_279_290