%0 Journal Article
%A Artur Rubin
%A Jean Rubin
%T Extended operations and relations on the class of ordinal numbers
%J Fundamenta Mathematicae
%D 1969
%P 227-242
%V 65
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/fm-65-2-227-242/
%R 10.4064/fm-65-2-227-242
%G en
%F 10_4064_fm_65_2_227_242