%0 Journal Article
%A A. P. Kombarov
%T On tightness and normality of $\Sigma$-products
%J Doklady Akademii Nauk
%D 1978
%P 775-778
%V 239
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1978_239_4_a5/
%G ru
%F DAN_1978_239_4_a5