%0 Journal Article
%A Zelinka, Bohdan
%T A note on periodicity of the 2-distance operator
%J Discussiones Mathematicae. Graph Theory
%D 2000
%P 267-269
%V 20
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DMGT_2000_20_2_a9/
%G en
%F DMGT_2000_20_2_a9