@article{Freudenthal_1931,
title={�ber die Enden topologischer R�ume und Gruppen},
volume={33},
ISSN={1432-1823},
url={http://dx.doi.org/10.1007/bf01174375},
DOI={10.1007/bf01174375},
number={1},
journal={Mathematische Zeitschrift},
publisher={Springer Science and Business Media LLC},
author={Freudenthal,
Hans},
year={1931},
month=dec,
pages={692–713} }