@inproceedings{noll2009telling,
  title = "Telling experts from spammers: expertise ranking in folksonomies",
  author = "Noll, Michael G and Au Yeung, Ching-man and Gibbins, Nicholas and Meinel, Christoph and Shadbolt, Nigel",
  year = "2009",
  booktitle = "Proceedings of the 32nd international ACM SIGIR conference on Research and development in information retrieval",
  organization = "ACM",
  pages = "612--619",
}