Media type: E-Article Title: Trees, valuations, and the Bieri-Neumann-Strebel invariant Contributor: Brown, Kenneth S. imprint: Springer Science and Business Media LLC, 1987 Published in: Inventiones Mathematicae Language: English DOI: 10.1007/bf01389176 ISSN: 1432-1297; 0020-9910 Origination: Footnote: Access State: Open Access