%0 Journal Article
%A S. Mrówka
%T On the potency of subsets of βN
%J Colloquium Mathematicum
%D 1959
%P 23-25
%V 7
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm-7-1-23-25/
%R 10.4064/cm-7-1-23-25
%G en
%F 10_4064_cm_7_1_23_25