@InProceedings{ThomasH07,
  author =       {Paul Thomas and David Hawking},
  title =        {Evaluating sampling methods for uncooperative collections},
  booktitle =    {Proceedings of ACM SIGIR 2007},
  pages =        {503--510},
  location =     {Amsterdam, Netherlands},
  year =         2007,
  month =        {July},
  note =         {\url{http://es.csiro.au/pubs/fp347-thomas.pdf}}
}