%0 Journal Article
%A P. A. Biryukov
%T Ranks of families of sets and properties of topological spaces
%J Doklady Akademii Nauk
%D 1981
%P 777-779
%V 257
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1981_257_4_a0/
%G ru
%F DAN_1981_257_4_a0