%0 Journal Article
%A Andruszkiewicz, R.
%T Essential Cover and Closure
%J Serdica Mathematical Journal
%D 2004
%P 505-512
%V 30
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SMJ2_2004_30_4_a3/
%G en
%F SMJ2_2004_30_4_a3