%0 Journal Article
%A R. Drabiński
%A E. Grzegorek
%T When $\aleph _1$ many sets are contained in a
 countably generated $\sigma $-field
%J Colloquium Mathematicum
%D 2009
%P 41-45
%V 115
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm115-1-5/
%R 10.4064/cm115-1-5
%G en
%F 10_4064_cm115_1_5