@article{approachabilityinunknowngamesonline,
  title = {Approachability in unknown games: Online learning meets multi-objective optimization},
  author = {Shie Mannor and Vianney Perchet and Gilles Stoltz},
  year = {2014},
  eprint = {1402.2043},
  archivePrefix = {arXiv},
  url = {http://arxiv.org/abs/1402.2043v2},
}