Media type: E-Article Title: A generalization of a theorem of Vogtmann Contributor: Charney, Ruth Published: Elsevier BV, 1987 Published in: Journal of Pure and Applied Algebra, 44 (1987) 1-3, Seite 107-125 Language: English DOI: 10.1016/0022-4049(87)90019-3 ISSN: 0022-4049 Keywords: Algebra and Number Theory Origination: Footnote: Access State: Open Access