%0 Journal Article
%A O. V. Kudinov
%T Compressed systems of finite approximations for sets in the class $\Sigma_2^0$
%J Matematičeskie trudy
%D 1996
%P 111-113
%V 30
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MT_1996_30_a5/
%G ru
%F MT_1996_30_a5