%0 Journal Article
%A I.L. Mel'nichuk
%T Semigroups with n-closed subsets.
%J Semigroup forum
%D 1989
%P 105-108
%V 39
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1989__39_2_134979/
%G en
%F SF_1989__39_2_134979