@misc{liu2019edge,
  title={Edge-Assisted Hierarchical Federated Learning with Non-IID Data},
  author={Lumin Liu and Jun Zhang and S. H. Song and Khaled B. Letaief},
  year={2019},
  eprint={1905.06641},
  archivePrefix={arXiv},
  primaryClass={cs.NI},
  url={https://arxiv.org/abs/1905.06641}
}