@inproceedings{ ViappianiRecsys09,
  url = {http://www.cs.toronto.edu/~paolo/papers/set_based_critiquing.pdf},
  booktitle = {Proceedings of the 2009 ACM Conference on Recommender Systems, RecSys 2009, New York City, NY, USA, October 22-25, 2009},
  year = {2009},
  author = {Paolo Viappiani and Craig Boutilier},
  title = {Regret-based Optimal Recommendation Sets in Conversational Recommender Systems}
}