%0 Journal Article %A R. Montague %A R. Vaught %T Natural models of set theories %J Fundamenta Mathematicae %D 1959 %P 219-242 %V 47 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-47-2-219-242/ %R 10.4064/fm-47-2-219-242 %G en %F 10_4064_fm_47_2_219_242