@inproceedings{au2009contextualising,
  title = "Contextualising tags in collaborative tagging systems",
  author = "Au Yeung and Ching-man and Gibbins, Nicholas and Shadbolt, Nigel",
  year = "2009",
  booktitle = "Proceedings of the 20th ACM conference on Hypertext and hypermedia",
  organization = "ACM",
  pages = "251--260",
}