@article{zigzaganewapproachtoadaptiveonline,
  title = {ZigZag: A new approach to adaptive online learning},
  author = {Dylan J. Foster and Alexander Rakhlin and Karthik Sridharan},
  year = {2017},
  eprint = {1704.04010},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1704.04010v1},
}