@article{CM_1937__4__235_0,
author = {Freudenthal, Hans},
title = {Bettische Gruppe mod. 1 und Hopfsche Gruppe},
journal = {Compositio Mathematica},
volume = {4},
year = {1937},
pages = {235-238},
zbl = {0016.28102},
language = {de},
url = {http://dml.mathdoc.fr/item/CM_1937__4__235_0}
}
Freudenthal, Hans. Bettische Gruppe mod. 1 und Hopfsche Gruppe. Compositio Mathematica, Tome 4 (1937) pp. 235-238. http://gdmltest.u-ga.fr/item/CM_1937__4__235_0/