%0 Journal Article %A John Doner %A Alfred Tarski %T An extended arithmetic of ordinal numbers %J Fundamenta Mathematicae %D 1969 %P 95-127 %V 65 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-65-1-95-127/ %R 10.4064/fm-65-1-95-127 %G en %F 10_4064_fm_65_1_95_127