%0 Journal Article
%A S. P. Gul'ko
%T On properties of subsets of $\Sigma$-products
%J Doklady Akademii Nauk
%D 1977
%P 505-508
%V 237
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1977_237_3_a0/
%G ru
%F DAN_1977_237_3_a0