%0 Journal Article %A Jan Jastrzębski %T On directional cluster sets %J Fundamenta Mathematicae %D 1983 %P 155-161 %V 115 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-115-3-155-161/ %R 10.4064/fm-115-3-155-161 %G en %F 10_4064_fm_115_3_155_161