Media type: E-Article Title: A generalization of Coxeter groups, root systems, and Matsumoto’s theorem Contributor: Heckenberger, István; Yamane, Hiroyuki imprint: Springer Science and Business Media LLC, 2008 Published in: Mathematische Zeitschrift Language: English DOI: 10.1007/s00209-007-0223-3 ISSN: 0025-5874; 1432-1823 Origination: Footnote: