@article{blackboxreductionsforparameterfree,
  title = {Black-Box Reductions for Parameter-free Online Learning in Banach Spaces},
  author = {Ashok Cutkosky and Francesco Orabona},
  year = {2018},
  eprint = {1802.06293},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1802.06293v2},
}