%0 Journal Article
%A V. I. Amstislavskii
%T Set-theoretic operations and recursive hierarchies
%J Doklady Akademii Nauk
%D 1966
%P 995-998
%V 169
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1966_169_5_a1/
%G ru
%F DAN_1966_169_5_a1