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The first author is pleased to acknowledge financial support from the Alexander-von-Humboldt-Stiftung and hospitality from the Ruhr-Universität, Bochum, during the preparation of this paper.
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Collins, D.J., Levin, F. Automorphisms and Hopficity of certain Baumslag-Solitar groups. Arch. Math 40, 385–400 (1983). https://doi.org/10.1007/BF01192801
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DOI: https://doi.org/10.1007/BF01192801