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The first and third named authors and the second named author thank the Deutsche Forschungsgemeinschaft and the NSF respectively for financial support for this research
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Bieri, R., Neumann, W.D. & Strebel, R. A geometric invariant of discrete groups. Invent Math 90, 451–477 (1987). https://doi.org/10.1007/BF01389175
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DOI: https://doi.org/10.1007/BF01389175