%0 Journal Article
%A Saharon Shelah
%T The spectrum of characters of ultrafilters on 
$\omega$
%J Colloquium Mathematicum
%D 2008
%P 213-220
%V 111
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm111-2-5/
%R 10.4064/cm111-2-5
%G en
%F 10_4064_cm111_2_5