@article{JMLR:v16:rakhlin15a,
  author  = {Alexander Rakhlin and Karthik Sridharan and Ambuj Tewari},
  title   = {Online Learning via Sequential Complexities},
  journal = {Journal of Machine Learning Research},
  year    = {2015},
  volume  = {16},
  number  = {6},
  pages   = {155--186},
  url     = {http://jmlr.org/papers/v16/rakhlin15a.html}
}