%0 Journal Article %A Jan Waszkiewicz %T $∀_n$-theories of Boolean algebras %J Colloquium Mathematicum %D 1974 %P 173-175 %V 30 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-30-2-173-175/ %R 10.4064/cm-30-2-173-175 %G en %F 10_4064_cm_30_2_173_175