@article{bwmeta1.element.bwnjournal-article-fmv2i1p25bwm,
author = {Hans Hahn},
title = {\"Uber die Komponenten offener Mengen},
journal = {Fundamenta Mathematicae},
volume = {2},
year = {1921},
pages = {189-192},
zbl = {48.0213.01},
language = {deu},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv2i1p25bwm}
}
Hahn, Hans. Über die Komponenten offener Mengen. Fundamenta Mathematicae, Tome 2 (1921) pp. 189-192. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv2i1p25bwm/