%0 Journal Article
%A A. V. Ostrovsky
%T On a question of L.\,V.~Keldysh concerning the structure of Borel sets
%J Sbornik. Mathematics
%D 1988
%P 317-337
%V 59
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1988_59_2_a3/
%G en
%F SM_1988_59_2_a3