@article{optimallearnersformulticlassproblems,
  title = {Optimal Learners for Multiclass Problems},
  author = {Amit Daniely and Shai Shalev-Shwartz},
  year = {2014},
  eprint = {1405.2420},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1405.2420v1},
}