%0 Journal Article %A Kyewon Koh Park %A Uijung Lee %T Entropy pairs of $\Bbb Z^2$ and their directional properties %J Studia Mathematica %D 2004 %P 255-274 %V 165 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/sm165-3-4/ %R 10.4064/sm165-3-4 %G en %F 10_4064_sm165_3_4