@article{2007,
author = {M\"uller, Gert H.},
title = {?ber die Eigenschaften der Teilmengen eines Kuratowski'schen Raumes - II},
journal = {Portugaliae mathematica},
volume = {10},
year = {1951},
pages = {53-70},
zbl = {0043.37901},
mrnumber = {0044106},
language = {de},
url = {http://dml.mathdoc.fr/item/2007}
}
Müller, Gert H. �?ber die Eigenschaften der Teilmengen eines Kuratowski'schen Raumes - II. Portugaliae mathematica, Tome 10 (1951) pp. 53-70. http://gdmltest.u-ga.fr/item/2007/