%0 Journal Article %A A. K. Layek %T On sectorial qualitative cluster sets and directional qualitative cluster sets %J Colloquium Mathematicum %D 1985 %P 281-288 %V 50 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-50-2-281-288/ %R 10.4064/cm-50-2-281-288 %G en %F 10_4064_cm_50_2_281_288