@article{PORMA_1946__5_4_114641,
     author = {Sierpinski, Waclaw},
     title = {Sur une propri\'et\'e des espaces m\'etriques d\'enombrables},
     journal = {Portugaliae mathematica},
     pages = {193--194},
     publisher = {mathdoc},
     volume = {5},
     number = {4},
     year = {1946},
     mrnumber = {0019913},
     zbl = {0061.39908},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1946__5_4_114641/}
}