%0 Journal Article
%A S. S. Ospichev
%T Computable families of sets in Ershov hierarchy without principal numberings
%J Sibirskij žurnal čistoj i prikladnoj matematiki
%D 2015
%P 54-62
%V 15
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/VNGU_2015_15_1_a4/
%G ru
%F VNGU_2015_15_1_a4