%0 Journal Article %A Maria MoszyƄska %T Theory of equidistance and betweenness relations in regular metric spaces %J Fundamenta Mathematicae %D 1977 %P 17-29 %V 96 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/fm-96-1-17-29/ %R 10.4064/fm-96-1-17-29 %G en %F 10_4064_fm_96_1_17_29