@article{MAN_1923__88_158989,
     author = {H. Tietze},
     title = {Beitrage zur allgemeinen {Topologie.} {I.} {Axiome} f\"ur verschiedene {Fassungen} des {Umgebungsbegriffs.}},
     journal = {Mathematische Annalen},
     pages = {290--311},
     year = {1923},
     volume = {88},
     zbl = {49.0397.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__88_158989/}
}