%0 Journal Article
%A Balcerzak, Marek
%T On isomorphisms between $\sigma$-ideals on $\omega_1$
%J Commentationes Mathematicae Universitatis Carolinae
%D 1990
%P 743-749
%V 31
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMUC_1990__31_4_a13/
%G en
%F CMUC_1990__31_4_a13