%0 Journal Article %A Matt Kaufmann %T On expandability of models of arithmetic and set theory to models of weak second-order theories %J Fundamenta Mathematicae %D 1984 %P 57-60 %V 122 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-122-1-57-60/ %R 10.4064/fm-122-1-57-60 %G en %F 10_4064_fm_122_1_57_60