%0 Journal Article
%A J. Paris
%A A. Wilkie
%T Counting $Δ_0$ sets
%J Fundamenta Mathematicae
%D 1987
%P 67-76
%V 127
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-127-1-67-76/
%R 10.4064/fm-127-1-67-76
%G en
%F 10_4064_fm_127_1_67_76