@article{10_4064_fm_73_1_1_7,
     author = {Anthony Berard},
     title = {Characterizations of metric spaces by the use of their midsets: intervals},
     journal = {Fundamenta Mathematicae},
     pages = {1--7},
     publisher = {mathdoc},
     volume = {73},
     number = {1},
     year = {1971},
     doi = {10.4064/fm-73-1-1-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-73-1-1-7/}
}