@article{hierarchicalfederatedlearningacross,
  title = {Hierarchical Federated Learning Across Heterogeneous Cellular Networks},
  author = {Mehdi Salehi Heydar Abad and Emre Ozfatura and Deniz Gunduz and Ozgur Ercetin},
  year = {2019},
  eprint = {1909.02362},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/1909.02362v1},
}