%0 Journal Article %A C. Belna %A M. Evans %A P. Humke %T Most directional cluster sets have common values %J Fundamenta Mathematicae %D 1978 %P 1-10 %V 101 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-101-1-1-10/ %R 10.4064/fm-101-1-1-10 %G en %F 10_4064_fm_101_1_1_10