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@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/} }
Müller, Gert H. �?ber die Eigenschaften der Teilmengen eines Kuratowski'schen Raumes - I. Portugaliae mathematica, Tome 9 (1950) no. 3, pp. 149-167. http://geodesic.mathdoc.fr/item/PORMA_1950__9_3_114687/