%0 Journal Article %A Ivo Klemes %T Examples of Λ(4) sets E and a graph structure in E x E %J Studia Mathematica %D 1999 %P 101-120 %V 133 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm-133-2-101-120/ %R 10.4064/sm-133-2-101-120 %G en %F 10_4064_sm_133_2_101_120