@article {0805.3018, archivePrefix = {arXiv}, eprint = {0805.3018}, primaryClass = {math.RT}, author = {Alex J. Feingold and Axel Kleinschmidt and Hermann Nicolai}, title = {Hyperbolic Weyl groups and the four normed division algebras}, publisher = {Elsevier B.V.}, year = {2008}, doi = {10.1016/j.jalgebra.2009.05.006}, url = {http://arxiv.org/abs/0805.3018} }