%0 Journal Article %A Andrzej Mostowski %T A formula with no recursively enumerable model %J Fundamenta Mathematicae %D 1955 %P 125-140 %V 42 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-42-1-125-140/ %R 10.4064/fm-42-1-125-140 %G en %F 10_4064_fm_42_1_125_140