%0 Journal Article
%A V. A. Vershinin
%T On certain operations over constructive sets with equality
%J Doklady Akademii Nauk
%D 1977
%P 269-272
%V 234
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1977_234_2_a1/
%G ru
%F DAN_1977_234_2_a1