%0 Journal Article %A Anthony Berard %T Characterizations of metric spaces by the use of their midsets: intervals %J Fundamenta Mathematicae %D 1971 %P 1-7 %V 73 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-73-1-1-7/ %R 10.4064/fm-73-1-1-7 %G en %F 10_4064_fm_73_1_1_7