@article{MAN_1926__95_159121,
     author = {A. Tichonoff},
     title = {\"Uber einen {Metrisationssatz} von {P.} {Urysohn}},
     journal = {Mathematische Annalen},
     pages = {139--142},
     publisher = {mathdoc},
     volume = {95},
     year = {1926},
     url = {http://geodesic.mathdoc.fr/item/MAN_1926__95_159121/}
}