@inproceedings{CKS09,
  title = "On the Performance of Approximate Equilibria in Congestion Games",
  author = "G. Christodoulou and E. Koutsoupias and P. Spirakis",
  year = "2009",
  address = "Copenhagen, Denmark",
  booktitle = "European Symposium, Copenhagen",
  month = "7--9 sep",
  note = "Also in arXiv:cs/0804.3160",
  pages = "251--262",
}