%0 Journal Article
%A Lihová, Judita
%T The Lattice of all Systems of $r$-Ideals in a Set
%J Mathematica slovaca
%D 1972
%P 50-58
%V 22
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MASLO_1972__22_1_a4/
%G en
%F MASLO_1972__22_1_a4