%0 Journal Article
%A Mátrai, Tamás
%T Covering $\Sigma^0_\xi$-generated ideals by $\Pi^0_\xi$ sets
%J Commentationes Mathematicae Universitatis Carolinae
%D 2007
%P 245-268
%V 48
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_2007__48_2_a6/
%G en
%F CMUC_2007__48_2_a6