@article{PORMA_1951__10_2_114505,
     author = {M\"uller, Gert H.},
     title = {�?ber die {Eigenschaften} der {Teilmengen} eines {Kuratowski'schen} {Raumes} - {II}},
     journal = {Portugaliae mathematica},
     pages = {53--70},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1951},
     mrnumber = {0044106},
     zbl = {0043.37901},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1951__10_2_114505/}
}