@article{MAN_1931__104_159490,
     author = {V. Niemytzki},
     title = {\"Uber die {Axiome} des metrischen {Raumes}},
     journal = {Mathematische Annalen},
     pages = {666--671},
     year = {1931},
     volume = {104},
     zbl = {0001.40701},
     url = {http://geodesic.mathdoc.fr/item/MAN_1931__104_159490/}
}