%0 Journal Article
%A Kenneth Schilling
%T On absolutely $Δ^1_2$ operations
%J Fundamenta Mathematicae
%D 1984
%P 239-250
%V 121
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-121-3-239-250/
%R 10.4064/fm-121-3-239-250
%G en
%F 10_4064_fm_121_3_239_250