@article{bwmeta1.element.bwnjournal-article-fmv29i1p17bwm,
author = {Hans Freudenthal},
title = {Die Bettischen Gruppen der Verbindung zweier Polytope},
journal = {Fundamenta Mathematicae},
volume = {28},
year = {1937},
pages = {145-150},
zbl = {0017.19101},
language = {deu},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv29i1p17bwm}
}
Freudenthal, Hans. Die Bettischen Gruppen der Verbindung zweier Polytope. Fundamenta Mathematicae, Tome 28 (1937) pp. 145-150. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv29i1p17bwm/