%0 Journal Article
%A J. Płonka
%T On k-closure operators in graphs
%J Colloquium Mathematicum
%D 1980
%P 373-381
%V 43
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/cm-43-2-373-381/
%R 10.4064/cm-43-2-373-381
%G en
%F 10_4064_cm_43_2_373_381