@article{CMH_1940__13_138766,
     author = {Hans Samelson},
     title = {\"Uber die {Sph\"aren,} die als {Gruppenr\"aume} auftreten.},
     journal = {Commentarii mathematici Helvetici},
     pages = {144--155},
     publisher = {mathdoc},
     volume = {13},
     year = {1940},
     zbl = {0024.08502},
     url = {http://geodesic.mathdoc.fr/item/CMH_1940__13_138766/}
}