@article{sparseallreduceefficientscalable,
  title = {Sparse Allreduce: Efficient Scalable Communication for Power-Law Data},
  author = {Huasha Zhao and John Canny},
  year = {2013},
  eprint = {1312.3020},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1312.3020v1},
}