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Supported in part by NSF Contract # DMS 8502278 and
# DMS 8603523 and a visiting fellowship from SFB 170, Göttingen
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Cohen, M.M., Lustig, M. On the dynamics and the fixed subgroup of a free group automorphism. Invent Math 96, 613–638 (1989). https://doi.org/10.1007/BF01393699
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DOI: https://doi.org/10.1007/BF01393699