%0 Journal Article
%A M. Zuckerman
%T Natural sums of ordinals
%J Fundamenta Mathematicae
%D 1972
%P 289-294
%V 77
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-77-3-289-294/
%R 10.4064/fm-77-3-289-294
%G en
%F 10_4064_fm_77_3_289_294