@inproceedings{ Viappiani2006b,
  publisher = {AAAI press},
  author = {Viappiani, Paolo and Faltings, Boi and Pu, Pearl},
  title = {Evaluating Preference-based Search Tools: a Tale of Two Approaches},
  url = {http://liawww.epfl.ch/Publications/Archive/Viappiani2006b.pdf},
  booktitle = {Proceedings of the Twenty-first National Conference on Artificial Intelligence (AAAI-06)},
  year = {2006},
  bibtex_key = {Viappiani2006b},
  month = {July},
  address = {Boston, MA, USA},
  pages = {205-211}
}