@inproceedings{middleton2001capturing,
  title = "Capturing knowledge of user preferences: ontologies in recommender systems",
  author = "Middleton, Stuart E and De Roure, David C and Shadbolt, Nigel R",
  year = "2001",
  booktitle = "Proceedings of the 1st international conference on Knowledge capture",
  organization = "ACM",
  pages = "100--107",
}