@misc{Bound for universal hash,
  title = "New bound for almost universal hash funcions",
  author = "Long H. Nguyen and Andrew W. Roscoe",
  year = "2009",
  journal = "Presented at the Summer School on Proable Security 2009",
  url = "http://www.comlab.ox.ac.uk/files/749/uhf.pdf",
}