%0 Journal Article
%A Yu. L. Ershov
%T $\Sigma$-definability in admissible sets
%J Doklady Akademii Nauk
%D 1985
%P 792-795
%V 285
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1985_285_4_a3/
%G ru
%F DAN_1985_285_4_a3