@article{JMLR:v10:helmbold09a,
  author  = {David P. Helmbold and Manfred K. Warmuth},
  title   = {Learning Permutations with Exponential Weights},
  journal = {Journal of Machine Learning Research},
  year    = {2009},
  volume  = {10},
  number  = {58},
  pages   = {1705--1736},
  url     = {http://jmlr.org/papers/v10/helmbold09a.html}
}