Subgroups of finite index in nilpotent groups

@article{Grunewald1988SubgroupsOF,
  title={Subgroups of finite index in nilpotent groups},
  author={Fritz Grunewald and Dan Segal and G. C. Smith},
  journal={Inventiones mathematicae},
  year={1988},
  volume={93},
  pages={185-223}
}

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