%0 Journal Article %A S. Mrówka %T Axiomatic characterization of the family of all clusters in a proximity space %J Fundamenta Mathematicae %D 1959 %P 123-126 %V 48 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-48-2-123-126/ %R 10.4064/fm-48-2-123-126 %G en %F 10_4064_fm_48_2_123_126