@article{BK04,
  title = "On the Competitive Ratio of the Work Function Algorithm for the $k$-Server Problem",
  author = "Y. Bartal and E. Koutsoupias",
  year = "2004",
  journal = "Theoretical Computer Science",
  month = "20 sep",
  note = "An early version appeared in STACS 2000",
  number = "2-3",
  pages = "337--345",
  volume = "324",
}