%0 Journal Article
%A Wroński, Stanisław
%T On proper subuniverses of a boolean algebra
%J Acta Universitatis Lodziensis. Folia Mathematica
%D 1997
%V 09
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AULFM_1997_09_a1/
%G en
%F AULFM_1997_09_a1