@article{CMH_1944__17_138845,
     author = {Hans Freudenthal},
     title = {\"Uber die {Enden} diskreter {R\"aume} und {Gruppen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {1--38},
     publisher = {mathdoc},
     volume = {17},
     year = {1944},
     zbl = {0060.40007},
     url = {http://geodesic.mathdoc.fr/item/CMH_1944__17_138845/}
}