%0 Journal Article
%A P. L. Ul'yanov
%T On a countable base and the conjugate class of a topological space
%J Sbornik. Mathematics
%D 1976
%P 13-33
%V 29
%N 1
%U http://geodesic.mathdoc.fr/item/SM_1976_29_1_a2/
%G en
%F SM_1976_29_1_a2