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R. M. S. Mahmood       Groups acting on trees with finitely generated
free subgroups of finite index       Applied Mathematical Sciences, Vol. 7, 2013, no. 107, 5321-5326
      http://dx.doi.org/10.12988/ams.2013.211528
Copyright © 2013 R. M. S. Mahmood. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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