@article{PORMA_1950__9_3_114687,
     author = {M\"uller, Gert H.},
     title = {�?ber die {Eigenschaften} der {Teilmengen} eines {Kuratowski'schen} {Raumes} - {I}},
     journal = {Portugaliae mathematica},
     pages = {149--167},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {1950},
     mrnumber = {0038641},
     zbl = {0039.39302},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1950__9_3_114687/}
}